Steve Jobs published his Thoughts on Music in February 2007.
I’ve taken the liberty of doing a little search and replace on this section:
Imagine a world where every online store sells DRM-free music books encoded in open licensable formats. In such a world, any player reader can play music display books purchased from any store, and any store can sell music which is playable books that can be read on all players readers. This is clearly the best alternative for consumers, and Apple would embrace it in a heartbeat.
It doesn’t seem like anyone is working very hard to make that vision possible. Quite the opposite, in fact.
What makes digital books different from digital music? | Ed Bott