This was my playlist during college for the indie tracks. Haven't updated it but I used the move itunes playlist to spotify feature before so hopefully everything works. I believe that around 2011-2013 was the best years of indie music.
If you enjoy easy listening, meaningful songs, I recommend Jon Bellion's The Human Condition album. Also, make sure you give his acoustics a listen ;D.
I think you may also enjoy this track, by AFTRHR.
Two Door Cinema Club are the most popular of my suggestions, and I really enjoy their songs. From the same album of the track I'm linking below (disc 2), I also recommend the live version of Undercover Martyn. I personally enjoy it better than the studio version from the previous album.
For now, I guess that's it :p
If I think/remember of anything else I'll make sure to tell you about it ;D