The South Holland String Quartet (Op.5 No.2) from The Stena Suite has been uploaded with both a normal version and a free viola part 'play along at home' version to enjoy during the lockdown period.  In the lockdown version, the sheet music is the Viola part.  The audio file is a recording of the whole quartet but of just the remaining three parts.  It is therefore possible to play a string quartet home alone while in lockdown.  A 'count in' of two bars at the beginning means you can start playing at the right time.