I use Spotify music on GTAV while playing, but ot do that, I need to use the tool DRmare Spotify Song Downloader to help me as Spotify doesn't support offline playback. But with this tool, nothing is impossible.
For Spotify and Denon Receiver connection, it is not a hard thing to do that. Here is an article to show you how to use Spotify on Denon Receiver via the DRmare Spotify Music Converter.