Lily Mastrodimos has been recording songs as Long Neck since 2014, first as a solo project while she was a member of Jawbreaker Reunion and now as a fully realized rock band, with drums and electric guitars and everything. Mastrodimos writes the kind of personal, introspective songs that might be expected of someone who recorded her first album “Heights” alone in her room with a single mic and an MBox. The strength of her voice and her convictions lend Mastrodimos’s songs an urgency and energy that is only amplified by the addition of, well, amplifiers. As a full band, which now includes Eden Pacheco, Alex Mercuri, and John Ambrosio, Long Neck makes music that’s somewhere between indie rock and pop punk--louder and faster than Mastrodimos’s solo output, but no less thoughtful.