I was raised in part by Captain Kangaroo, a children's television host whose show featured a lot of music, from children's songs and folk songs to some of the building blocks of the classical music repertoire. The other day during Storytime as Mary led the kids through a song, I wondered "Where else can kids today learn the basic, bedrock songs like 'Twinkle Twinkle Little Star' or 'Old MacDonald'?" Sure, there's Sesame Street, but they feature mostly original material. I mean, it's not like a kid can download "This Old Man" into their iPod.
I work with another library on a project to promote their jazz music collection, and I thought the same thing: what a wonderful resource the library is for providing exposure to all sorts of music. You need to know about Louis Armstrong and Miles Davis --- and the library is the place, whether it's jazz, classical or knick-knack paddywhack!