You know I don't think I really paid attention to the octave lower singing. (I am a beginner) I will ponder this. I guess if I just have the chords (think guitartabs.com) I will be prone to doing this and singing the song by memory- often changing the octave to suit me... I guess the answer would be to pick out the octave on my keyboard with sheet music and start from there. Interesting- Thanks for the feedback.