Dear Mrs Trellis,
The only thing you need to be concerned with is the Off switch on your radiogram. This can usually be found on top of the appliance and generally marked On / Off; failing that, if you follow the wire from the back of the set to the wall you could unplug it.
Indeed the composers to whom you referred fall outside the generally accepted dates of the classical era, 1750 ~ 1825, but casting Gershwin and Prokofiev as from the same school is an interesting observation since Gershwin lived and died within the lifespan of Prokofiev. Whilst Gershwin was of emigr? Russian parentage his compositions were more populist than Prokofiev's whom some attest to be the greatest composer of the 20thC.
I feel a thesis coming on; like you, perhaps it's an age thing

Sergei Pastis - completely unqualified