Funny enough, I never use songs. Multisphere decks I use have some natural "glue" right off the bat. But I would consider using them if those effects was not restricted to printed.

I almost never use songs, but I love their inclusion in the card pool. It's the kind of deckbuilding tool that gives options to the player to open new possibilities, especially for newer players or unique combos. Also, it's a nice way of avoiding Master's Malice.

Blue Mountain Trader killed the song...

Not entirely, but hard enough.