The official My Little Pony Spotify account has created themed playlists for each of the Mane 5!
Every playlist contains a mix of My Little Pony songs and mainstream/non-MLP music.

Sunny's Starry Songs: https://open.spotify.com/playlist/2gpAJBPiQyA20Kk8BtkeIu
Izzy's Magical Mix: https://open.spotify.com/playlist/3zugqD5VQ7t3Ia0DDauOAJ
Pipp's Party Playlist: https://open.spotify.com/playlist/1MKZ4TzGtbbQiBkw7ehHJV
Zippin' Around with Zipp: https://open.spotify.com/playlist/3j5QUmtsAJNjP3ik6ZYGhS
Hitch's Hoppin' Hits: https://open.spotify.com/playlist/5kbnxOB4Zp9sxyHfErrBWQ