Can anyone offer me any help on this? 
 
I own Rock Band (the first one!).  The Rock Band Network can't be opened in that, only in Rock Band 2.  If I borrow Rock Band 2 from a friend and buy a couple of tracks from RBN, will they work on my copy of Rock Band?  I'd hate to spend the money and then not be able to use them... 
 
Thanks in advance for any help!  I'd go to rockband.com and ask on their forums, but Giant Bomb people are always nice.

Yeah they'll work. The songs you buy will be compatible with both Rock Band 1 & 2. You know is it me or does every time you go into the Rock Band store it kicks you out while your looking at the songs.

Thanks!   
 
I wouldn't know about being kicked out, because I can't bloody get on it in Rock Band 1.  :D

I don't know where ch13696 got his information, but Rock Band Network songs DO NOT work with Rock Band 1. Here's a quote from a developer to prove it, see point 4. 

Thanks Timma.  
 
And screw you, Ch1396!  ;-)