Yes, take the means to find your own note. I know one (sadly a music teacher) who appears to think that the first note in a song is the key - recipe for disaster, and was once badly set up (I think unintentionally) by a squeezer. I asked for a C chord and he gave us a C note. The start note of the song is G. Result - disaster!

And yes, an accompaniment can be MOST useful to help people to stay in key.