Hi sergioadh, I assume this question's about Xbox Music on the Xbox console.
You can add a song to "now playing" by pressing X on any song (instead of pressing A.) That adds it at the end of now playing, instead of replacing now playing with just the song. I slip up on that all the time.
Then, if you're in the now playing view, there are a couple ways to go to a specific song within the playlist.
Unfortunately there's no 1-step "I gotta hear that song now, then get back to whatever was playing before" option. There should be...
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