i think the singers room is very important, because like you said yes our voices are an instrument, that should be used to the glory of God. the singers room can help people with their voices, because there are some people that don't take care of their voices. like tieing their neck up with a scarf when they are around a lot of air or getting the proper rest to rest their voice and body and also like staying away from to many dairy products. all these kind of things singers need to know and most don't. most singers have just been singin since they were in the church choir so singin is just what we do, but as you and your voice go on and on becomes to be a wear and tear your voice and body, because of not giving it the proper care. that's why a lot of people are always wondering why they're horse right after they sing and its just from not giving it a little t.lc.; but yeah to all the singers i encourage you to keep on sangin yo heart out for de lawd!
remember every instrument is important when beeing used for God, because it can break down everyone of satan's strong holds, because it's in the power of praise and worship.