Muse performs at Oracle Arena in Oakland on Dec. 15, 2015. I doubt I’ll ever get to go to as many concerts as I did in 2013. My goal was see 50, and I saw 64. In judging what I enjoyed most, I decided to grade based on my…

Charli XCX performs at Slim’s in San Francisco on Nov. 1, 2013. Roman Gokhman/STAFF. SAN FRANCISCO — It’s only been six months since English pop singer-songwriter Charli XCX released her first album, yet she’s already debuted a new song and video, and will soon complete her second record. It’s…