Thats awesome! Did they sing the songs "Wait till the sun shines, Nelly", and a particular little number that went a little something like this:
"Hello to Yogi, hello to BooBoo, hello to ____too,
Barney and Fred say hi,"
the rest I can't make out...
The singing shrooms near the skyride at King's Dominion in the movie Rollercoaster are shown singing these songs