This is a web-app I've done as a school project. I was issued to use spotify APIs to get users playlist, search for songs, ecc..
In this web-app the player is functioning even though I don't have premium, for this I used Youtube-APIs, basically I changed the preview_url inside spotify packages with the audio url I get after search the name of the song + the artist on youtube
There are some bugs but maybe in the future I'll try to fix them