These channels each contain a mix of the vocals and instrumental tracks such that: [11] #grade (DO NOT REMOVE THIS LINE) bohemian_1 = 2 instr + 1 vocals bohemian_r = 1 instr + 2 vocals The above equations just give the linear combination of instr and vocals that create the bohemian_1 and bohemian_r channels. Can you manipulate the two channels to isolate each track? Basically, you need to solve the system of equations to find instr and vocals given the arrays bohemian_1 and bohemian_r. [13] ipd.Audio(instr, rate=bohemian_rate) [ ] [ ]: NameError [10] ipd.Audio (vocals, rate=bohemian_rate) [10]: in ----> 1 ipd. Audio (instr, rate-bohemian_rate) NameError: name 'instr' is not defined 0:00 / 0:00 Traceback (most recent call last) D