While it is more likely for the artist to enjoy covering the song if they are already familiar with the artist, you can ask the artist to cover any song you would like. The artist will do his or her best to cover (or struggle through covering) the song and post it sometime before the end of January.
Send me a message and I'll contact the band to see if we can work something out.
I hate to impose the limit on those rewards, because I know that kind of thing will be popular, but it's for the band's sanity. I'd hate for any of the bands to find that they suddenly have to cover 30 songs before the end of January. Two is much more manageable.
Don't worry, you can still adjust your pledge. Just go to the top of this page, click the blue "Manage Your Pledge" button, add $8 and you're done! As long as you adjust it before the deadline, there should be no problem.