Most days, my warm-ups began by asking the choir "Where's your A?".  I was always curious about relative pitch and if it could be taught or trained.  I think that answer is yes because by Halloween, even the least talented among us could sing an "A" - as they had memorized the pitch.

From there, I would say "Drop the octave" and everyone would sing an A major scale.  "Where's your E?"  "Bass II's sing the scale descending."  "Where's your C?"  "Where's your G?"  "Alto II's sing the scale descending.:  "Where's your Bb?"  "Tenors and Basses, sing this falsetto with the Sopranos and Altos - do NOT drop that octave!" If you are familiar with the NJ All-State Chorus audition scales, you will see the pattern here covering every voice part in daily scale work.