After becoming parents, Mathews and Gehl composed songs to entertain their toddlers, and subsequently recorded an album of these songs titled Happy Songs, released in 2002. They began performing concerts in schools and libraries. In 2004, they released Bottle of Sunshine and formed a rock band. Current members along with Mathews and Gehl are Cord Neal on bass, Tom Moon on drums, Brian Simms on keyboards and Micheal Sheppard on electric guitar. All the members of the band sing. Milkshake videos can be seen on the program Jack's Big Music Show on the Noggin TV network, the Miss Lori and Hooper block of programs on PBS Kids affiliates and in the cartoon ToddWorld on Discovery Kids. Their 2007 CD release, PLAY!, featured Baseball Hall of Fame member Cal Ripken on a song called "Baseball" as well as songs from the ToddWorld cartoon. A DVD compilation of videos called Screen Play, and a comic book featuring the band in various adventures based on their songs were released in 2008. The 2009 release Great Day CD, was nominated for a 2010 Grammy Award for "Best Musical Recording for Children".