Albums
How do I delete multiple albums from my library at once?
iPhone 14
To highlight one song, click it.
To highlight a range of songs, click the first, hold Shift, and click the last.
To highlight a bunch of selected songs that are not in order, hold the CTRL (Windows) or COMMAND (Mac) key and click each one.
To highlight all the songs in the view, click any one, and then CTRL-A or COMMAND-A.
Once you have highlighted the ones you want, right-click and choose Delete from Library.
Caution, doing big deletions creates potential for trouble, so I strongly suggest you do small batches.