It's nearly half over, but the year of the dueling streaming services has already given us plenty of reasons to press play. Mumford went electric, Dylan went Rat Pack and Mark Ronson went to the top of the charts. D'Angelo made a huge impact on 2015 with his bold return (after 14 years without a new album), which was followed by comeback LPs from Faith No More (after 18 years) and the Sonics (49 years). And of course there has been no shortage of newcomers — indie wordsmith Courtney Barnett, hip-hop's giddy Rae Sremmurd, high-concept dance crew Future Brown — turned heads as well. Here's the best of 2015's first six months.