Originally Posted by Guz2
I seem to remember one of the songs from Metallica's Master Of Puppets has a 5/4 signature...I think it was Battery...
You might be thinking of Leper Messiah. Lars counts in the song with five hihat hits ("ONE! TWO! Tssch, tssch, tssch, tssch, tssch"), but the actual song is in standard 4/4 (it's surprising how many people think it's in 5/4 based purely on that intro though). Other than that, I can't think of any 5/4 songs on Master Of Puppets.
edit: Actually, there are single bars of 5/4 in Battery, where they sing the "BATTERY" line, but no prolonged sections of 5/4.