All summer, we've been telling you about a new project involving some very old songs. "Songs in the Key of LA" is a collection of sheet music from the LA Public Library, compiled by USC professor Josh Kun and his students.

A part of that project, the band Ozomatli, will be perfoming tonight at Cal Plaza in Downtown L.A. 

We like to think the band is best-known for our theme song, which they wrote, but of course they're known for much more. The band's Will Abers and Ulises Bella joined Kun and host Alex Cohen in the studios in July, to talk about their music and Kun's ongoing project.