Well if you wanted a stupid answer I could say you would be able to play music using an Mp3 player if you don't have an instrument. All trolling aside.
>>4 "I mean, "playing" music, but except not. Not actually creating music in real life, but imagining it concretely..."
Do you mean when you create music in your head but don't actually write it and plan it out in real life? Like improvisation in your head?