If you were in New York last night, you might have noticed the Empire State Building flashing a bunch of colors on and off. You probably figured it had something to do with the 4th of July.
You're partly right. In fact, the display was synchronized to a live performance more than 1,000 miles away, in Chicago. The surviving members of the Grateful Dead are playing a series of farewell concerts at Soldier Field - the site of their last shows in 1995 before founding guitarist and band leader Jerry Garcia died - and the encore last night was a song called "U.S. Blues."
According to Rolling Stone, the Empire State Building's lighting director Mark Brickman worked with the band to coordinate a light show that went with the band's performance. Video of the light show was displayed to the crowd of Deadheads in Chicago.
If you missed it, you can tune in for a repeat tonight at 9pm ET. You can listen to the song on radio station 104.3.
Here's what it looked like, synced with the original version of the song.