INT 62 u - FGDRIVER v4.02 - "FG_MUSICB" - PLAY SERIES OF NOTES IN BACKGROUND
	AX = 0081h
	CX = number of repetitions (negative = continuous play)
	ES:BX -> '$'-terminated music string in BASIC(Beginner's All-purpose Symbolic Instruction Code) A programming language originally designed as a means of teaching FORTRAN.  There are many variations of BASIC with differing capabilities; the majority are interpreted but compiled BASIC is becoming more popular.	All genuine IBMInternational Busiuness Machines personal computers (including the latest PS/2IBM PS/2, any model models) come equipped with a cassette-based BASIC interpreter in ROM. PLAY format
Notes:	the FGDRIVER functions are rearranged with each major release, but
	  their parameters do not change (see #03474 at AX=0000h)
	This call is ignored if asynchronous sound (AX=00A5h,AX=00A8h,
	  AX=00AAh) is already in progress
SeeAlso: AX=0059h,AX=0081h,AX=00BDh,AX=00DCh