Question:
Answer:
Catechumens who, moved by the Holy Spirit, seek with explicit intention to be incorporated into the Church are by that very intention joined with her. With love and solicitude Mother Church already embraces them as her own. (Lumen Gentium, 14)
Catechumens, while not fully members of the Church, are united to the Church in a special way (canon 206, 1183; Catechism 1249).
If Catechumens, who are not baptized, are considered united to the Church in a special way then even more so for those who are baptized (who called candidates) and are explicitly seeking to be in full communion with the Church.
While it has never been definitively settled whether non-Catholics can be cantors at Mass, catechumens and candidates are in a different situation. They should be considered eligible to fulfill the ministry of cantor at Mass.