I think this is talking about the noun "A stand" i.e a music stand as opposed to the verb "To stand".
A stand as in a stall or holder of some sort is "stondin" not "stand"
Actually you can use Stand for something like a holder e.g Stand arddangos (Display stand). I've only ever seen Stondin used to describe a stand at a fair or that sort of thing.
Couldn't hear it properly
Stondin cerddoriaeth = music stand?