Rav Yitzchak Abadi z"l was of the opinion that one should ideally refrain from listening to music year round because of the Gemara’s discussion of aveilus over the Chorban. However, that restriction on music applies specifically to music used for extra enjoyment and elevated simcha. When music is used therapeutically, to restore a person from sadness or emotional depletion back to a healthy baseline, it is not considered the same type of simcha.