I recently started developing a skill for Amazon Alexa for SoundCloud. It allows you to connect your account and play your stream, your favorites and also playing by searching.
I would love to get feedback and discuss further ideas of discovering music via Alexa!
I made a demonstration video that you can watch here: https://www.youtube.com/watch?v=wSHEiSqE0WE
If you are interested in some technical details (programming) I wrote a blog post at my company about this: https://techdev.de/soundcloud-for-alexa-getting-started-with-an-audio-playing-skill/