Jem Aswad Senior Music EditorSultry R&B singer Sabrina Claudio, who released one of last year’s top albums of the genre with “Truth Is,” has dropped a Christmas-themed song and video called “Warm December.” While the lyrics have a straight-up holiday theme, the music is closer to her brand of R&B, with an even more intimate and torchy vibe.“Warm December perfectly introduces the sentiment and temperature of the album as a whole,” Claudio says.