Bands I'd love to see as DLC for Rock Band:
Bal Sagoth 
AJFA has by far the best drumming on any metallica record. It's also the most technically ambitious album. I'm not really trying to defend it but it is miles in front of black album and death magnetic. It's side B is amazingly strong.
To Live is to Die is probably my favorite Metallica instrumental.
Type O Negative
Likely a very unpopular opinion: I'd be the ultimate hypocrite if I said I had anything against downloading music, as I've downloaded thousands of songs, but I personally believe all music enthusiasts should put some money into the hobby. The occasional record purchase, supporting favorite artists in live shows, buying vinyl, whatever. It's of course pretty unrealistic to expect someone to spend hundreds of thousands of dollars on music, but I do think it's possible to develop a large sense of entitlement. A record a year is fine for all I care, just prove those hardcore anti-piracy guys at least somewhat wrong.
Besides, beyond the whole up-your-ass-with-morals angle, vinyl does kick the living **** out of MP3.
Blow yer' harmonica son
What, that's totally fine. I buy hard copies of stuff I like. I just went and bought the new Coldplay album the day it came out. I coulda got it off Amazon for $10 and had it shipped to my house on release, but I opted to wait until the end of the day, go to a store(after having to ask if it was in stock, even!), and bought the bundle that came with a sweet t-shirt for $22. On top of the Rock Band DLC, that's $32 for a single artist over a single album(promotion).
I also bought the new Fray single legally, with some credit Amazon was offering(still is, if anyone has a Twitter and wants $2 for a music purchase on Amazon). Hard copy? No. Money to the controlling parties? Yes.
Witticus: "GeeNef speaks to me like schizophrenia, his words touch me where my priest could reach."
The Afterman: Acension 10.09.2012
The Afterman: Decension 02.05.13