It depends on your skill level, if you are able to follow along then go for it, A lot of gospel progessions are and usually after one time through you pretty much know where they are going.
But if you are not able, give it time and experience, you will be able to follow after a while, meanwhile let them sing without music. If I can't figure the song out then the only thing I am doing is causing distraction trying to figure it out so I just sing along (if I can) some people seem like they are singing a song a they made up in there car on the way to service!
Peace!