He was a founding member and the former guitarist of the American alternative rock band Weezer, prior to his firing before the release of their self-titled debut album.
When Wellner showed up unannounced in New York with no place to stay, Rivers Cuomo considered it the final straw and informed Cropper that he had to leave the band.
[1] Weezer collaborator Karl Koch said: "He wasn't handling it well ... he always said he was fine, and then 20 minutes later he'd be up on the roof of Electric Lady screaming or something.
[3] Bassist Matt Sharp said the decision was not triggered by a single event, but instead a series of "tiny infractions" that threatened the band's chemistry.
Prior to the expanded deluxe edition of The Blue Album in 2004, this was the only Weezer track released to feature Cropper on guitar and backing vocals.
In 1996, Cropper played guitar on Uncle Bob, an alt-rock album from 22 Jacks, which featured members of Wax, The Ramones, Adolescents and Agent Orange.
Cropper sang the theme song for the 2002–2003 American sitcom Andy Richter Controls the Universe and in early 2006 began showing signs of returning to the music business.
He continued to contribute to Buffalo Alice, co-writing and producing their third album Alexander Rosenhoff Testament: A Work Of Fiction (2008), and was listed for a time as bass player on the band's website.