Spotify was still in private beta when I heard about it. But I managed to get my hands on it. I didn't like it at that time, I thought it was over hyped. But in this years' first quarter, I gave it another try. I was not disappointed.
Here are the reasons why I've been using Spotify daily for quite some time now. This is my personal opinion and if you have something to say, please, start a conversation on twitter or in the comments.
Love the way you play
I've tried some other music streaming apps, but to be honest, Spotify was the only one to deliver painless streaming. Every time. And this is one of the biggest advantages against other apps or services.
Let's build a playlist
Collaborative playlists. One of the best features. The only problem with this (and the same applies to normal playlists) is, that you can add more than one instance of the same song to one playlist. I hate that. You add a track and somebody else adds the same track, again. There could be at least a warning when doing so. But overall, collaborative playlists are nice and a great way to discover new music.
Offline mode
Well, you're not online all the time, but you need to listen to some music when there are no interwebz around. Offline playlists are the solution. Create a playlist, click Available offline and you're done. Of course, you have to wait for Spotify to sync all the music to your hard drive first. Then you'll be able to listen to your music offline.
A lot of music for not-so-much money
This is the best part of Spotify (and any other music streaming service to be fair). You pay some money to the company and you get millions of songs. To be exact, you pay approx. 15€ a month. And if you're a music junkie like I am, you'll pay that price and enjoy the music.