As a former news researcher on Breakfast, for such an item I would have briefed the presenters on all instruments featured in the band along with bios and historical evolution. If this occurred (and I know not whether it still does), these presenters would have been subjected to a bollocking at the post-transmission production inquest.

As for "peasants" being unable to distinguish an accordian from a melodeon, indeed they would not unless particularly clairvoyant as these instruments had not yet been invented in their countries of provenance, still less been transported to and incorporated into English music.

I am taking "peasants" as a somewhat derogatory term intended to encompass pre-industrial revolution musicians. These were highly skilled on the instruments available to them (excluding free reed ones, obviously) and were highly pissed off when the new-fangled organ led to their being booted out of church galleries.