Damian Lillard, or to be more specific, Dame D.O.L.L.A., is still proud of his debut album, “The Letter O,” which he released late in the summer of 2016. After dabbling in music for years, the process of recording and releasing “The Letter O” gave Lillard an opportunity to learn the specifics, often through trial and error, of what it takes to create a full length album. The project, which was generally well received, was a validation of sorts for the Oakland native, as it proved he had the chops to do more than string together four bars once a week on Instagram.