10. NoCopyrightSounds: Free music channel hits the charts
Views in May: 137 million
Total views: 1.4 billion
Subscribers: 6.7 million
NoCopyrightSounds was founded by Billy Woodford in 2011 after he grew frustrated with trying to licence music to accompany videos of him gaming.
Woodford was named as one of the UK's top young entrepreneurs last year by new business news service Startups.
He told the website that NoCopyrightSounds generates revenue through advertising deals with YouTube and Spotify, and is profitable.
9. DisneyJuniorUK: The home of Disney Junior on YouTube
Views in May: 141 million
Total views: 3 billion
Subscribers: 2.3 million
DisneyJuniorUK is the YouTube home of Disney's television channel. It houses clips from kids' favourite shows, as well as exclusive videos.
Popular titles include "The Lion Guard", a spin-off of 1994 film "The Lion King", and fairytale series "Goldie & Bear".
8. AdeleVEVO: Brit singer says "hello" to 158 million requests
Views in May: 158 million
Total views: 4.5 billion
Subscribers: 12.4 million
The spike in Adele's YouTube channel in May can be attributed to the "Send My Love" video landing. Since going live, it has racked up 104 million requests.
7. Toys AndMe: Unboxing delivers sweet success
Views in May: 166 million
Total views: 97 million
Subscribers: 1.2 million
Toys AndMe features the adventures of Nottingham-based vlogger Tiana as she unboxes toys and candy treats.
Tiana has quite the sweet tooth and in one of her most popular posts, she unboxes a giant Chuppa Chup lolly.
6. SevenSuperGirls: Girl power delivers hits
Views in May: 214 million
Total views: 5.5 billion
Subscribers: 5.1 million
SevenSuperGirls is a collaboration of seven teenage vloggers. Six of the seven girls are based in the US, while EmilyJade contributes from the UK.
The Super Girls started uploading videos in 2008, when they launched the channel with a video introducing themselves and their favourite things.
5. Britain's Got Talent: It's a "yes" to Simon Cowell's franchise
Views in May: 285 million
Total views: 4.3 billion
Subscribers: 6.2 million
Britain's Got Talent was on television in May and took full advantage of its platform on ITV to post a big month of views.
Acts that piqued the interest of YouTube users included a group of dancing Storm Troopers and Alex Magala, a sword swallowing mad man.
3. Coldplay Official: YouTube channel on the "Up & Up"
Views in May: 323 million
Total views: 4 billion
Subscribers: 6.7 million
British band Coldplay published "Up & Up" in May, the third single from their seventh album "A Head Full Of Dreams." It has since been viewed 52.4 million times.
2. TheDiamondMinecart: Daniel Middleton is a Minecraft maestro
Views in May: 341 million
Total views: 7.5 billion
Subscribers: 11.5 million
Daniel Middleton's adventures on TheDiamondMinecart have provided him with a platform to launch a live tour and a range of merchandise. Known as DanTDM, the gamer first joined YouTube in 2012.
1. LittleBabyBum: Nursery rhyme channel tops the pile
Views in May: 413 million
Total views: 8.4 billion
Subscribers: 7 million
Launched in 2011, LittleBabyBum is one of the biggest educational channels on YouTube and is primarily a home for animated nursery rhymes for children.
The channel is available in five languages and posts two videos a week, as well as a compilation.
LittleBabyBum is run by Derek Holder and his wife. He told The Guardian last year that he was surpised by the channel's success: “It’s been mindblowing. Staggering. We pinch ourselves every day,” Holder said.