Musicians typically release one album at a time. Twelve or so songs, once per year at most.. usually more like every two years. While outside the studio, they tour to promote the current offering.

With MP3s, the notion of an album is only a holdover from the media of the past. Songs are the level of granularity we’re looking at today. So I predict that some artists will move to a model where they record a dozen songs at once in the studio and they release one song at a time, on a rolling schedule, until they get back into the studio. Tours would feature a rolling set list, which might add a song or two as they are released. The single would come out first, so the artist can perform it at all shows. While on the road, the artist could work out different arrangements for the songs (as naturally happens anyway), prehaps resulting in a remix or two. Song-level releases would keep the act continuously fresh for audiences and the artist alike.

Someone must be doing this already. Who is it?

(On the other hand, it breaks the continuity of an album. How would people react if “Dark Side of the Moon” were released one song at a time? No, thanks.)