Yo Alt, here's the mashup of Pandora and Good Day.
http://www.youtube.com/watch?v=oNgtUa40XGg&feature=youtu.be
If it sounds bad, then duhhh lol. Good Day is 10bpm slower than Pandora so I had to speed it up by 10bpm, and the key signature of the songs are interchangeable for the most part but Good Day goes off in a different chord progression that doesn't match with Pandora's. The verses don't match well either, Pandora's progression is very simple(down the scales) while Good Day on the other hand is pretty much stuck on one chord so unless you like listening to dissonance it's just not gonna work. Then there's also the crappy source files, seeing as how IU is supposedly one of the best singers in K-Pop I find it amazing how no one out there has the acapella or vocals only track. Pandora's the same but it's probably because the song hasn't been out for more than a week.
Either way, that's that lol. I actually wanna do a full remix with this but the huge bpm difference between the two songs and the fact that there's no proper source out there is gonna be a pain in the ass. There's only so much EQ'ing and compression bombing can do. The studio at my uni does have a vocal extractor in Pro Tools but I have no damn clue how to use it. So unless I can somehow get a good source, I think this'll be the last time I'll work with both.