Since there is no requested feature forum (that I can find), I'm using this. Would love it if I could say, Alexa, play soft jazz for 60 minutes. I have always used the sleep timer feature of a clock radio in the evenings to fall asleep. It occurs to me (maybe others) that this would be a great use for an Echo. If only you could set a time for which the music would play. If it were source independent, Spotify, iHeart, Amazon, that would be great.
Oh and if that happens, wake to a music source would be nice as well. Alexa, wake me at 6AM to Spotify, Heavy Metal.
Ooo! just noticed you can select feature request, vice question, up in the add a tag section.