Retrieving deleted song from Apple Music library

I deleted a song from a playlist and I was given two options to delete from the library or the download, so stupidly I deleted it from the library and now it's completely disappeared, it's showing under purchased but there is no ability to retrieve it anywhere .... I've done it with a few songs and but I only realised after this one as it was part of an album

[Re-Titled by Moderator]

Original Title: Deleted song from Library