Is there a way to view one's iTunes Match content online?
Solution 1:
No. The clients that access the data are iTunes on the Mac and Windows OS as well as the music app on iOS.
I've seen some desktop iTunes libraries get messed up and not ask to delete a song from the cloud. In that case, set up a new user account on the same computer and sign in and try the delete again.
- iTunes Store: How to delete songs from iCloud