Multi-Grammy Award nominated singer/songwriter/producer Charlie Puth has officially unveiled his new single ‘How Long,’ ‘How Long’ marks the second single released from Puth’s highly-anticipated sophomore album,VOICENOTES (available January 19th), and the follow-up to 2016’s RIAA Platinum certified debut album, NINE TRACK MIND.   Listen to ‘How Long’ here   ‘How Long’ was solely produced by Puth and written with collaborators Jacob Kasher (‘Attention’) and Justin Franks (‘See You Again’). With ..