I have three main criticisms of Spotify, just in case there's a Spotify PM reading.

1. I hear repeat songs in my discover all the time, this isn't ideal. I curate my own playlists for moods and know that i'm getting when I play those playlists, surfacing songs I've manually curated in my discover doesn't add value to my experience.

2. I wish I could more easily surface the discover playlists of my friends or those whom I follow. I know that my friends like similar music but the small differences might provide insightful curation data and help me discover new music, so, it'd be interesting to see the data on discovery curation through social connections.

3. There's some chatter about daily mixes here. I find that my daily mixes don't change enough. I'll try them once, two times, then I'll churn from using that feature.