Okay, so I was first going to put this vid up and say that it was me dancing, but a lot of you would soon guess that this guy is considerably older than me and quickly flush  it out as a ruse.

So here's my real question - I LOVE The Black Keys and the music they play just drives me and hits me to the core; I don't even know what genre their music would be considered so I put it here; I would so enjoy being able to jam with some of their music ("Howlin for You" is another of my favs); how do you go about doing that???

Would I necessarily need to find the sheet music to figure out the key and chords/notes that it's in?  Is there a key progression that I can play within, sort of making it up as I go?

A few months ago I learned Blackbird because I had hoped to play along with the Beatles, but I apparently learned it in a key other than what they played it in (back then, I assumed that if there was sheet music on a song that it must be in the key the artist performed it..... uh, not so lonely boy), and I haven't taken the time to transpose it.  I don't want it to be that much work, I just want to jam along.

Anyone have any ideas how to do this; or are any of you already doing this with your favorite music?  I just don't know how to start.