Mandolins evolved from early European lutes and became integral to bluegrass, folk, and Celtic music. With their double-course strings and bright, ringing sound, mandolins offer rich harmonic textures. Top manufacturers include Gibson (F-5), Kentucky (KM-150), Eastman (MD515), and Weber (Gallatin A-Style). Mandolins are favored for intricate melodies, fast tremolo picking, and ensemble playing in folk and bluegrass settings.