The Kirby: Triple Deluxe Soundtrack became available through Club Nintendo of Japan on April 30, 2014 and through Club Nintendo of Europe, as well as Australia on September 23, 2014. The CD contains 46 tracks from the game as well as three "Triple Bonus Tracks" at the end of the album. The soundtrack's composed by Hirokazu Ando & Jun Ishikawa.
I have yet to play Triple Deluxe, so I can't say that I'm familiar with the music(aside from the series motif) but I noticed that virtually everywhere I've looked online, I haven't been able to find the album to download or at the very least, a decent quality rip of the album. I uploaded my copy at 320kbps and used the titles from the European release, crediting both Jun Ishikawa and Hirokazu Ando on the tracks that they've composed. I couldn't find exactly who wrote the bonus tracks 47-49 but I found a couple sources listing credit to Hal Laboratory, with no single composer mentioned. While I would assume it would be either Hirokazu Ando or Jun Ishikawa, I can't find out for sure which one.. So I just labeled them together on those tracks. Just a heads up, If you're in the market for a physical copy, it's becoming quite scarce but you can find a few on ebay going from $50-100.