Alexander Giannascoli (born February 3, 1993), better known by his stage names Alex G or, formerly, (Sandy) Alex G, is an American musician, producer, and singer-songwriter. He started his career playing in multiple local bands such as the Skin Cells before he decided to pursue his own music career as a soloist. At 17, he began to record his own music and released his first album under the name Sandy (Alex G) in 2010. DIY self-releases on Bandcamp and began building up an audience with his label debut, DSU (2014), released on Orchid Tapes to critical acclaim from various publications. He later signed with Lucky Number, who reissued his earlier releases, Rules and Trick (2012).

In 2015, he signed with Domino Recording Company and released his sixth studio album, Beach Music. He followed it in 2017 with Rocket, which received further acclaim and recognition. Giannascoli's eighth studio album, House of Sugar, was released in 2019. In 2022, Alex scored American director Jane Schoenbrun's film We're All Going to the World's Fair, and later released his ninth album, God Save the Animals. He signed with RCA Records in early 2024, and additionally scored Schoenbrun's I Saw the TV Glow.