Cornerstone Music Gear is a family-owned boutique pedal builder based in Ispra, northern Italy, near Lake Como. The company was founded by Emilio Massari, an aerospace engineer who set out to recreate a specific overdrive sound he couldn't find in commercially available pedals, alongside his wife Linda Lunardon, who handles the business and logistics side. The brand's tagline — "Pedals to inspire. Pedals to improve." — reflects its focus on plug-and-play designs aimed at working guitarists rather than heavily tweakable, menu-driven effects.

Cornerstone's catalog centers on overdrives and distortions built around touch-sensitive, amp-like response. Models include the Gladio SC single-channel preamp, the dual-channel Gladio, the Colosseum, the Imperium, the Antique, the Aquarium, the Nero, and the Nucleo. The Gladio SC in particular is widely associated with Dumble-style overdrive voicings and has become something of a signature piece for the company.

The pedals are hand-assembled in Italy and distributed internationally through boutique dealers such as Peach Guitars, Guitars Rebellion, The Guitar Sanctuary, and Cottonwood Music Emporium, as well as the used market on Reverb. Cornerstone has built its reputation primarily through word of mouth in the boutique overdrive community, where the pedals are often compared to higher-end valve preamp tones.

Cornerstone has 13 products cataloged on Equipboard, including Overdrive Effects Pedals, Electric Basses, and Univibe & Rotary Effects Pedals. Their gear is featured by 3 artists, with the strongest followings in Blues, Rock, and Funk / Soul. Notable users include Robben Ford, Ariel Posen, and Paul Davids.