My question would be WHY does she want a music major? Is it for enjoyment or does she have a career in mind that will require it? If it’s the former, spreading engineering over 5 years (assuming a 120 major requirement) should give her a fair amount of room to cover the music classes she’d like to take - if they don’t have prerequisites that are difficult to fit in. If it’s the latter, she’s going to have to plot it out and see if it’s even possible. Keep in mind that upper level classes in most majors are not as available during summer sessions as lower levels. So later summers may not have class options and she may be better off interning or something in that mode,.