Draw the family to a special level of involvement, the rite instructs:
152. Whenever possible, ministers should involve the family in the planning of the funeral liturgy: in the choice of readings, prayers, and music for the liturgy and in designation of ushers, pallbearers, readers, acolytes, special ministers of the eucharist, when needed, and musicians. The family should also be given the opportunity to designate persons who will place the pall or other Christian symbols on the coffin during the rite of reception of the body at the church and who will bring the gifts to the altar at Mass.
Note that the rite designates the family for “involvement.” Not final decisions. Music ministry is given a deeper treatment, with an ideal situation (choir) and a fallback position (cantor):
153. An organist or other instrumentalist, a cantor, and whenever possible, a choir should be present to assist the congregation in singing the songs, responses, and acclamations of the funeral liturgy.
The choir serves others, according to the rite. While beauty and quality are important standards they should not impede the liturgical standards of beauty and quality, namely, in the expression of Christian faith through ritual.