Google's most popular songs of 2022 have one thing in common they all went viral on TikTok. Here's how they became the hits of the year.

Google recently released a list of its most "trending" searches of 2022, split up into categories like movies, games, "Who Is?" questions, and more.

The ranking included Google's five most popular songs of the year, which range from chart toppers by stars like Harry Styles and Sam Smith to an unexpected meme hit that uses a documentarian's rap vocals.

Besides being catchy and including memorable lines, the commonality between all the tunes was that they went viral on TikTok. Some of them have soundtracked hundreds of thousands of videos on the platform, which might explain why they landed at the top of Google's list and were also incredibly popular on Spotify.

The songs spawned intriguing and creative trends, from people sharing montages of their lives before the pandemic and comparing it to them now, to clips of creators performing wiggling and jiggling dances.

Here are the top five most googled songs of last year, and the backstory behind how they vaulted to internet virality, and why TikTok viewers were so hooked that they couldn't stop making videos using them.

Google's fifth-most popular song of the year, according to Google, was Harry Styles' "As It Was," a buoyant synth-pop hit that dropped in April and served as the lead single to the British star's third solo album, "Harry's House."

The song went mega-viral, racking up over 1.7 billion plays on Spotify and sitting at the top of the Billboard Hot 100 chart for 15 weeks, which was longer than any British music act had ever managed before, according to Billboard.

The track's music video has almost 400 million views on YouTube and features Styles performing choreography and walking along a revolving platform with the dancer Mathilde Lin.

The song also dominated TikTok this year, soundtracking at least 2.6 million videos. It sparked a huge trend with over 3.7 billion cumulative views where people would post nostalgic before-and-after pictures and videos in sync with Styles saying, "You know it's not the same, as it was," comparing memories from a year ago or pre-pandemic to their lives now in 2022.

SiriusXM's Mikey Piff told Styles about the trend during an interview in May, and the musician said he hadn't heard of it but that he was going to search for it.

As tends to happen with songs this popular, there was a flurry of other types of videos using it too, like clips featuring cute pets performing different lyrics. One of the most popular videos shows a creator building a house in the game "The Sims."

Recently, the song kicked off another craze where people used a sped-up version of the song to recap their 2022, often with a fast-paced montage of different months or pictures from the year.

The fourth song on the list was "Unholy" by the pop musician Sam Smith, featuring Kim Petras. The song centers around the theme of unfaithfulness and features a strong, pulsing bassline, and a metallic hyperpop sheen.

Since it was released in late September, the track has already notched up over 620 million plays on Spotify, and its music video has over 93 million views on YouTube. The song topped the pop charts in multiple countries.

"Unholy" went viral on TikTok after Smith posted a video of them and Petras dancing to it in the studio in August. It's been used in over 580,000 videos on the platform.

A lot of the most popular videos feature creators lip-syncing to the song and then transitioning into a different outfit when the bass drops.

The third most searched-for song of the year was the DJ duo Duke & Jones and the journalist and documentarian Louis Theroux's "Jiggle Jiggle." The chill electronic-rap song features rap vocals originally from a segment Theroux did on "Weird Weekend," a television series in which he interviewed members of fringe communities, where he rapped a little.

Theroux's rap received renewed attention after he repeated it during an episode of the BBC show "Chicken Shop Date" in February 2022.

Theroux's rap snippet — and the iconic lines "My money don't jiggle, jiggle, it folds, I like to see you wiggle, wiggle, for sure," went viral on TikTok in March 2022 after Duke & Jones posted an Auto-Tuned remix to the platform. A full single by the three was eventually released in May.

The song has been used in over 6.4 million TikToks, with many of the top videos performing a dance routine synchronized to the lyrics. The TikTok creators wiggle, dribble, pretend to drive a car, and relax, among other actions, in sync with Theroux's lyrics.

One of the most popular early videos to feature the trend was a clip of the leading actors from "Riverdale" dancing to it. Their video has amassed over 14 million likes.

Duke & Jones and Theroux released a remix of the song with Jason Derulo in August.

Taking the runner-up spot on Google's trending songs list was "Surface Pressure," a reggaeton song made for the 2021 Disney animated movie "Encanto" and sung by the actor Jessica Darrow, who voiced Luisa Madrigal in the film. It was written by Lin Manuel-Miranda.

The song has amassed almost 300 million views on YouTube and vaulted to number eight on the Billboard Hot 100 chart.

"Surface Pressure" gained a lot of traction on TikTok, featuring in over 125,000 videos to date. It's been used in an eclectic array of clips, from a woman dashing on a treadmill while carrying dumbbells to someone coloring in droplets of water with paint.

The song also became part of a TikTok trend where people shared how they related to the "Encanto" character's internal emotional struggle, as reported by Mashable.

At number one was another song from "Encanto" — "We Don't Talk About Bruno," a Latin pop tune also written by Lin-Manuel Miranda.

The song was performed by multiple members of the cast, including Carolina Gaitán, Mauro Castillo, Adassa, Rhenzy Feliz, Stephanie Beatriz, and Diane Guerrero.

A video for the song with British sign language has over 2.2 billion views on YouTube.

The song went viral on TikTok, soundtracking over 880,000 videos across multiple versions of the sound. Many of the top clips feature people lip-syncing to the vocals.

The sound also spawned a trend where people began with one statement about trying to do a task, and then transitioned into something that countered the first statement, or was its achilles heel, as Mashable reported. For instance, in one video, a creator said they finally decided to commit to TikTok but were then told by viewers that they had "bad vibes."

The song was widely critically acclaimed, climbing to number one on the Billboard Hot 100 chart in January and garnering a Best Song Written for Visual Media award nomination at the Grammys.