GA-20 is an American blues band from Boston, Massachusetts consisting of Matthew Stubbs, Cody Nilsen, and Josh Kiggans. The band is named after the guitar amplifier manufactured by Gibson from 1950 to 1961. They primarily play Chicago blues. In 2018, GA-20 were nominated for a Boston Music Award for Blues Artist of the year. They have been nominated for the award eight years in a row. They won Blues Artist of the Year in 2019, 2021, 2022, 2023, 2024, and 2025. They were nominated for their first Blues Music Award in 2022 for Best Emerging Artist. In 2023 GA-20 was nominated for Blues Band of the year and their album Live In Loveland was nominated for Live Blues Album by the Blues Blast Awards. They won Blues Act of the Year at the 2024 New England Music Awards.