i think somebody said after HTDAAB release (it may have been Dr Who) that you shouldnt need to advertise albums. they should promote themselves though radio and music tv channels.
I said this?
In theory, though, this is true. Radio and music tv stations should do the work.
But the world keeps changing. MTV, for example, means nothing now. Artists still make videos, but really, it's more for YouTube and their own website than it is for MTV.
Radio stations - at least the ones that play Top 40 - have a pre-determined setlist. It's tough for artists to break through there.
Hence, U2 have had to resort to other ways to get their music heard (and this isn't just true for U2). This is why we see more and more artists, both new and old, use commercials, TV appearances (SNL, David Letterman, etc.), movies, whatever, to get their music out there.
Because of illegal downloads, it's tough to say if all of this effort has an effect. But it's clear that even with legal downloads, the music world is changing. Flo Rida, for example, sold over 600K copies of a song, but is struggling with the album. More and more, it looks like the era of the song is back, while album sales will drop. I wouldn't be surprised to see artists release single songs in the future, and eventually compile them all into an album at some much later time. That is, they create an album full of songs, but don't release the album - just a digital release of a new song every 3-4 months for a while. Then, when all the "hits" are done, they release the digital album, with a few extra songs thrown in, compiling these hits.