Number of music majors as opportunity indicator for non-con LACs?

My understanding is that you can do a dual major if the major programs are in the same school, such as math and english- both majors in LSA. The degree would be BA with dual major. Or a BM in music ed and music performance, both in the SMTD. Dual degree is 2 majors in different schools like what my son did, math- a BA from LSA and BM from SMTD.