This Companion explores women's work in music since 1900 across a broad range of musical genres and professions, including the classical tradition, popular music, and music technology. The crucial contribution of women to music education and the music industries features alongside their activity as composers and performers. The book considers the gendered nature of the musical profession, in areas including access to training, gendered criticism, sexualization, and notions of 'gender appropriate' roles or instruments. It covers a wide range of women musicians, such as Marin Alsop,  Grace Williams, Billie Holiday, Joni Mitchell and Adele. Each thematic section concludes with a contribution from a practitioner in her own words, reflecting upon the impact of gender on her own career. Chapters include suggestions for further reading on each of the topics covered, providing an invaluable resource for students of Feminist Musicology, Women in Music, and Music and Gender.