Manasquan singer-songwriter Kevian Kraemer, at 18, has had his “Dopamine” released by Elektra Records. At 16, the multi-instrumentalist was doing sessions and studying at the Lakehouse Music Academy.  (He plays drums, guitar, piano, sax, bass and ukulele.) With a high-powered Los Angeles management company already in his corner, he’s certainly matured from being the precocious pre-teen posting music videos of himself on Instagram.