<p>It’ll hurt you for sure, anything less than a 4.0 is bad (54% of people at Harvard are 4.0’s. I doubt anywhere near 54% of the qualified applicants are 4.0’s so it’s a huge boost) for these schools, but it’s not a killer and 1 grade will be seen as an anomaly, not a downwards trend. Not to mention that as a music major, your grades aren’t as important and your musical skill (which seems to be great) will be more important. So I wouldn’t stress it.</p>