Title basically says it all, but let me explain the situation a little more...
I'm helping a family member with the music at her wedding this summer. I'd like to be able to set up a few playlists from e.g. my own MP3 collection and then need a (preferably) software solution that would allow me to mix/switch between playing music from my custom playlists and from my Pandora account.
I know I could accomplish this by say, starting a playlist on my iPod, and then manually switching to the Pandora app, then switching back, etc. What I'd really like it something maybe a little more automated, or at least something that would give smoother transitions between MP3 / Pandora. I'm looking for something that will run on windows (XP, 7), OSX, or an app that will run on an iPod Touch.
Free is the best, but I wouldn't mind paying a reasonable price for the right solution.