Student or Learner
You are welcome. I am glad we enjoy listening to this beautiful song.
I put a song onto my facebook and my friend thanked me. We share the same favorite song.
Here 'welcome' is an adjective, as it is in "You are welcome to listen to my song; you are welcome to my home"
But 'welcomed' can be used as a past participle. "On your arrival at the hotel, you will be welcomed by our concierge." This is part of the verb, not an adjective.