Richard Miller does not provide a breakdown of registers for the three lower voice parts in his book Securing Baritone, Bass-Baritone, and Bass Voices or in his book The Structure of Singing: System and Art in Vocal Technique, nor does he give any indication of their overall ranges capabilities. Oxford Music Online states the range a baritone will typically sing in an opera is A to F."Baritone," in Oxford Music Online (Oxford University Press, 2014), accessed December 7, 2014, http://www.oxfordmusiconline.com/subscriber/article/opr/t237/e846?q=baritone&search=quick&pos=2&_start=1#firsthit. They do not indicate which A or F-sharp; however, it can be assumed, since a baritone's range is lower than that of a tenor, that the A is A2 and the F is F4. Baritones are capable of reaching notes higher than F4 and lower than A2. The same is true of Oxford Music Online's proposed range for bass voices, which it lists are E to E or F."Basso," in Oxford Music Online (Oxford University Press, 2014), accessed December 7, 2014, http://www.oxfordmusiconline.com/subscriber/article/opr/t237/e923 The first E is probably referring to E2 and the second as E4 or F4.
