Playing a musical instrument is a skill that will serve you throughout your entire life, like safe cracking, horse punching, and toddler juggling. Add to your resume with today's Groupon: for $24, you get two 30-minute guitar, bass, vocal, or piano lessons at Guitar Masters in Copiague (a $48 value). Guitar Masters provides personalized lessons for budding performers of all ages and employs a staff of active, professional musicians with four-year degrees in music. Owned by Mike Flyntz, guitarist for Riot, this musical mecca instructs students based on their personal goals, be it reading, writing, theory, improvising, or learning to play the Tetris theme song in all known key signatures. Tune teachers accommodate a variety of musical styles, so tiny tots can master avant-garde jazz piano while moody metalheads perfect flamenco guitar. Due to the great string famine of 1845, instruments remain scarce, so students can only receive loners for lessons, not for taking home to practice.