Harold Dean Miller, a Mennonite writer, travels around the country with his family, giving talks about Christian music, and performing concerts at churches. Several of the children have cochlear implants, and the family sings beautifully. Since it is four-part acappella singing, I would think they can hear music well enough.
PTL for the successful surgery.
I'll second the PTL.
Just reporting what Rush himself said about his future potential for hearing music.