I don't have any of their songs.
Who do I have to get drunk in order to get "Red Solo Cup" in Rock Band?
It all depends on what you're looking for. I equate them a lot to Bon Jovi, as their sound is somewhat similar, and in many ways, the charts compare pretty well too.
This is well deserved. Free Spirit is a favorite at my house and at my parties, and it's thanks to RBN that I purchased the album (sadly, online, I wish I could get a physical disc, but that's hard in the US), and I think the only band my party members have also purchased songs for (outside of RB) from playing them at my parties.
I have hopes that in honor of this award, we get a bunch of their songs ported over to the PS3, and I think HMXLachesis may have hinted as much in the PS3 song request thread.
<Insert request for more Boston here>
DLC: lots+RB1+LRB+RB2+ACDC+GDRB (+ RB3)
Incidentally, these two links
document the start of my personal affection for Free Spirit. (Before that, I enjoyed their music, but now it's got a bunch of sentimental value.)
By the way, Pankrazzo, thank you for the recommendation!
(The links also demonstrate that I am a giant geek, but I'm sure that can be overlooked. Right?)
Congrats Free Spirit..
I thought they were a young band that just wanted to bring back the old rock sound.. come to find out they weren't LOL.
The Cure 
My Chem. 
Band's pretty "eh". But whatever. They have a couple really good songs.
8/9/11 (Def Leppard) will be marked as the best day in RB history for me. HMX, major thanks for all this amazing DLC you put out!