When I click the Plus (+) sign next to a song, where is it saved to?

[Goldenphawkes]

I have a very simple question, the answer for which no amount of Googling has given me: 

When I click the plus sign (+) next to a song and get a message that says that the song has been added to "Your Music", exactly WHERE in "Your Music" does the song get saved to?

I can't find the song under any Playlists or under Songs - so WHERE ARE THEY GOING? My Googling has shown that there are a lot of people asking this question and as far as I've been able to tell, no one has found an answer. 

Please help! Thanks in advance!

[Peter__]

The + should add them into "Songs"/"Albums"/"Artists.

What device are you using?