to B or not to B ( when maybe A or G is fine )

What is the highest note you should ask the congregation to sing? Currently our leader bounces around F# above middle C ( F#4)

In his book " Here I Am To Worship", Tim Hughes specifies Bb2 to D4, just above middle C. How high should we be singing? David Crowder is often quoted as saying to move the songs to a higher key, and people will sing louder. That works as long as you're David Crowder and people are a captive audience paying $20 to sing along with you.

Not sure it works in a congregation

your opinions

JC