What "Kind" of Singer Would You Call a Baritone and Tenor Singer?!?!?!?

I am trying to put the names of people in a band, with their talent next to them in the credits. I got the lead singer, lead guitar, b guitar, and drums. There is a baritone singer and a tenor in the band also. I was just going to put background vocals and b, but on the website it has them as baritone and tenor. So how would you name them? Like "baritone singer" and "tenor singer" or "baritone vocals"? If your not sure, please leave your opinion! Thanks! :)