Formerly the part sung by the highest male, or counter-tenor, voices; now the part sung by the lowest female, or contralto, voices, between in tenor and soprano. In instrumental music it now signifies the tenor.
I visited Jobs for the last time in his Palo Alto, Calif., home. He had moved to a downstairs bedroom because he was too weak to go up and down stairs. He was curled up in some pain, but his mind was still sharp and his humor vibrant. Walter Isaacson
When Steve Jobs and Steve Wozniak created Apple computer in a garage in Palo Alto, it heralded the beginning of the PC revolution that ultimately dealt a death-blow to dozens of older companies. Eric Ries
So I played alto for quite a while until I saved up the money for the baritone. Gerry Mulligan
Then, of course, I played alto and tenor, wherever there were jobs. Gerry Mulligan
The baritone can serve functions that the alto and tenor cannot, in orchestral voicing. Gerry Mulligan