I have always thought that Brian's voice on the song, "Be Here In The Morning" off of the Friends album, was kinda cool. It must be his "head voice" because he is not straining and he is not singing real loud either.
Is this a good example of Head Voice??
http://www.youtube.com/watch?v=9Vbclu8ELDEBeekeeper
It's actually Alan, who definitely sings in falsetto. Re: the Brian head voice debate compare the screechines of Al's voice compared to some of Brian's mid 60's leads.