I recently added streaming music service "Jamendo Music" to WEB panel of Vivaldi Browser. This is nice! I can do net-surfing with listening music. I can pause & play & skip music without changing tab or App. So, I think it is good to add this feature to new sidebar of Opera. Like this!↓
I think it is good to be able to listen music of Spotify or Google Play Music or Amazon Prime Music or Pandora or YouTube or Jamendo or AccuRadio or SoundCloud, and so on by sidebar of Opera. I think it add attraction to Opera!