Led Zeppelin songs aren't playing?

[#1]

I'm in browser, in Firefox. Everything else works perfectly and I have no issue playing music by any other band. However, when a Led Zeppelin song comes up in a playlist, the song is skipped. When I search for a Led Zeppelin song directly and click on it to play it, it also doesn't work. The songs are not greyed out or marked as unavailable, but when I try to play them, they display as 0:01 in length, and no sound (not even the first second of the song) plays in that time: it sometimes seems to make two or three attempts to play it, all with the same result, and then just moves on to another song. This applies to all songs by this band and I have not encountered it with any other band.