Hi, according to the rules of University of Delhi all the colleges under it would deduct 2.5% marks from best of four percentage of a candidate if ob=ne of the subjects included in the calculation of best of four isn't mentioned in either LIST A or LIST B. You will be granted admission with music only if after deduction you still pass the cutoff bar for the particular course and the college.

You can find bothe the list of subjects in the Bulletin of Information released by DU for the academic year 2019-20: http://www.du.ac.in/adm2019/pdf/17062019-UG_BULLETIN_JUNE17Revised.pdf

Good Luck