I started out my playlist by watching other trip videos, and borrowing the songs I like from them, then using youtube/itunes to find more that are either the same style, or same artist, and listen through their other songs until I find some more that I really like. I have a variety of songs, from ones that work to dance montages, more chill ones, Disney ones, and ones that are slower for those emotional bits to really pull on the heartstrings.
I like to use stuff by Phillips Phillips, One Republic, Owl City, One Direction, Katie Sky, Taylor Swift has some good ones. It's all about experimenting/listening to a lot of music!