Musicians haven't been needed to provide music, either. And believe me, the ability to record, and especially the addition of sequencing, sythesizers, and sampling have totally changed the roll of the musician--The first time I went into the studio, more than twenty five years ago, if you wanted to make a recording of a band, you needed warm bodies. Several yearss ago, a band I was got a contract to record an album of material for release in a former Communist block nation--All the instrumentals and vocals ended up being done by one guy(not me) and and a producer/engineer--the rest of us weren't very happy, but that is another story--