Check several Songs and delete them at once

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If you could make a playlist of the songs you have edited. You could email the song-code to yourself.

Uff, that would be hard: I edited lots of standards according to chords in '577 Jazz standards', added a '557' to the songname, but didn't make a playlist of them.
Copying to a playlist would be easy, if I search '557', mark all and move them to the new playlist.
But here we are at the root of the thread: It is not possible, to mark several (or all) songs in a search to apply any treatment (delete, move...). Pitty! Would be a great help...