Oh, those halcyon days of 2010, when somebody could casually mention, "I like that Pop Ups CD," I'd track down the album and BOOM! Mind. Blown.
Even after their second album, Radio Jungle, was nominated for a Grammy this year, Brooklyn's Pop Ups are finally getting around to publicly showing a video from that 2010 debut, Outside Voices. It's for the song "Subway Train," and it's just had its premiere at the New York International Children's Film Festival. Animator Garrett Davis (who also did "Box of Crayons") gives each of the animals riding the train their own personalities. This could have easily played Sesame Street 20 years ago.
The Pop Ups - "Subway Train" [YouTube]