This can pretty much be considered the ""official"" song pack for my mod, ActualMusic. It cover nearly every area and event trigger, leaving out only a select few (5 total) that I didn't feel were necessary. It even includes a few songs that will only be useful in a later version of ActualMusic. Each and every song is by Arata Iiyoshi, made originally for Pokemon Mystery Dungeon: Explorers of Sky.
I chose this music in particular because when I make a song pack, I like to keep to a single source. PMD:Sky has one of the largest soundtracks in my the library of games I own, so it was easily able to fill every song trigger in ActualMusic (and then some). This pack can serve both as a good song pack for use in your game, and as a great learning tool for making your own song pack. Every usable trigger with the exception of "BiomeTypePlains" and a few Day/Night variants are filled, and it includes some examples of redirection and custom zone music.