A 7-string guitar expands the range of a standard guitar by adding a lower string, opening up deeper tunings and a wider tonal palette. It’s popular with players who want tight, defined low-end without sacrificing access to higher notes, making it well suited to metal, progressive, jazz, and experimental styles. The extra string allows for heavier riffs, extended chord voicings, and more fluid transitions between rhythm and lead playing. Despite the added range, a well-designed 7-string guitar should still feel balanced and playable, encouraging creativity rather than getting in the way of your technique.