Another iphone music/spotify question (sorry!)

ArcticFox

I want to play the Tangled soundtrack at DD's party, but I'd love to have it on my phone so we can play it elsewhere.  It isn't on Pandora, and I know it is on Spotify, but I don't have a paid membership (I used the free trial up).

What would you suggest?  If I pay for a couple months of Spotify, then if I let my membership lapse, I can't access tracks even if I downloaded them for offline use?  Should I just get it on iTunes?  Are there other music apps you would recommend?  I don't think I want to pay $120 a year.

(BTW I have a really nice Bluetooth speaker that I plan on playing the music on.  I didn't particularly want to get the CD, I prefer it in digital format so it is easily portable).