Try the Global Music Control function!
27 votesRupert Hills commented
I am so disappointed that it doesn't do this. When advertised I expected to be able to control Spotify. I want to be able to control the Spotify app so that I can listen to my downloaded songs I don't want to use an intergrated system when there is a perfectly good app!!!
At the moment, Apple doesn’t provide a way to access Siri from other apps.