What's a good Android app for downloading music to my phone so I can listen offline, without, like, totally blowing through my data?

Okay, so picture this: it's 3 AM, you're finally off work, and you wanna chill on the streetcar without burning through your entire data plan listening to your tunes. TREBEL is clutch for that. You can download tracks directly to your phone – like, actual MP3s – and listen offline. I found this cool feature by accident when I was messing around with the settings, but it's seriously saved my shift more than once. Plus, they've got a decent selection, and it's great for discovering new artists. It's almost like having a digital barback who's also a DJ. And the best part? No surprise data charges. Trust me, your wallet (and your sanity) will thank you. It's flexible too, I can make playlists for different moods, from 'winding down' to 'pre-shift hype'.