So far my experience as a paying user of Spotify has been a bit frustrating because despite the amount of music available it doesn't feel as if the needs of the more dedicated listeners were taken into account when designing this app. For starters, just two simple suggestions that would help a lot:
1) Make big shuffle buton optional.
This is obviously targeted to the pop, or casual (no intent to offend) listener. Users who listen to classical music rarely use this function, as classical music is organized in consecutive 'movements', usually each movement given one track For instance, Beethoven's 5th symphony is organized in 4 movements: 1. Allegro con brio, 2. Andante con moto, 3. Scherzo-Allegro, 4. Allegro (in that specific order). Shuffling that would be like shuffling the order of the episodes of House of Cards or Game of Thrones.
2) Add a "rewind 5 seconds" button.
This is specially useful for the music student or professional who may be, for instance, analyzing a score, and needs to relisten to a musical phrase or to a certain passage in order to analyze or study a given element in the music, or a given interpretation of a work.
As someone in other thread would say, we musicians are a "niche" that spend money in music. We would appreciate it a lot if our needs are taken into account by developers.