I bet this has been covered before, but I feel the late great Chet Baker also influenced Herb Alpert. I think Chet's singing served as a sort of "springboard" for Herb. They both have that "vulnerable" yet emotional tinge in their voices. It's sad Chet is no longer with us, yet he left a vast and wonderful recorded musical legacy behind. If any of you have not seen his movie from 88-89 rent "Let's Get Lost" a great portrait of the artist and much great music therein.