Travis Barker and Post Malone Are br Writing New Music Together Barker performed 20 songs by Nirvana br with Malone last month. They managed to br raise over $500,000 for the br COVID-19 Solidarity Response Fund. Barker has revealed that the pair are jamming br and writing some new material together. Travis Barker, br via statement Travis Barker, br via statement Barker also admitted that he thought it was a joke br when he was asked to learn 20 Nirvana covers in br a matter of days for the live-stream.