Love Letters (Straight From Your Heart) by Victor Young & Edward Heyman (1945). This is the 1961 Ketty Lester arrangement. Settings are: Pop > Rock 12/8; Tempo > 42

I guess this is Oldies/Doo-Wop/R&B and belongs here in the Pop forum, even though she toured with Cab Calloway. Rosemary Clooney sang it as a ballad in the 50s, and pianist Josh Nelson released a very hip instrumental jazz version in 2007.

Love Letters (Bb Pop)