This is the only tartan on the Scottish Register with 'Musician' in its name.
The information held within The Scottish Register of Tartans for the "42nd Regiment (Musicians)" tartan is shown below.
STA ref: 5870
STWR ref: none
Designer: Wilsons of Bannockburn?
Tartan date: 01/01/1819
Registration date: This tartan was recorded prior to the launch of The Scottish Register of Tartans.
Category: Military
Restrictions:
Registration notes: An entry in the 1819 Key Pattern Book of William Wilsons of Bannockburn (weavers) reads 'To make the band or musicians Plaids you have only to put Scarlet in place of the Black in the Sergts Plaids.'
I don't pretend to understand the notes, so make of it what you will.
Regards
Chas