We've seen many albums released on Rock Band via official DLC. In retailers, most albums sell for under $15, but with official RB DLC they sell for $20 and under. This can happen because of pack discounts.
Look at the albums Doolittle and Blood Sugar Sex Magik available on Rock Band. Doolittle sells for $19 for the full album, but it would be $28 if all tracks had to be purchased separately. BSSM sells for $20, but it would be $32 for all tracks separately purchased! The price becomes fairly unreasonable at a certain point (and I feel for the Wii owners who don't have the bundle discount option available for normal RB DLC).
It's not my intention to single out specific artists who are bringing albums to the RBN and how they are pricing their songs, but I think there are a couple good ways to approach the pricing in general with the RBN's lack of a bundling option:
The first method for an artist bringing an album with a considerable number of songs on it (more than ten songs at $2 will start getting over $20) would be to release all of the tracks at $1. If you're releasing 14 or 16 songs like Doolittle and BSSM, that makes the prices $14 and $16 respectively, which is closer to Rock Band's bundle pricing than the $28 and $32 figures and also much more reasonable.
The second method I had in mind for releasing an album with many songs would be to release a handful of tracks (likely between 1 and 5 depending on the length of the album and the number of noteworthy songs) at the $2 price point. These might be the singles from the album or the stand-out tracks. Then price the rest of the album's tracks at $1. So a 14-song album with three songs priced at $2 would be $17 total, which is very close to the bundle discount. And a 16-song album with four songs priced at $2 would be $20 - right in line with BSSM's bundle pricing.
What do you think? Should artists releasing albums or most of their discography take these approaches into consideration?