1) "Grove" originated as a print dictionary (encyclopedia really) that has been in continuous publication since 1878 in many updates and editions. Accessible in two versions:
The New Grove dictionary of music and musicians. 29 volumes. In print.
Grove Music Online comprises the full text of The New Grove Dictionary of Music and Musicians, The New Grove Dictionary of Opera, and 4 others. Updated periodically.
"Grove" in either print or online form is "the first stop for music research."
In English. Extensive bibliographies and composer "works lists". Biographies and subjects; arranged alphabetically. Contains extensive articles on the music of geographical locations. Search by location or by specific musical instrument.
Online version includes the New Grove dictionary of American music.
Examples:
Popular music: Beyoncé Fela Kuti Miriam Makeba Kanye West
Jazz: Mary Lou Williams Sidney Bechet Duke (Edward) Ellington
Classical: Jessye Norman James DePreist Marian Anderson
Techniques: Tongue-clicking Stride (piano)
Geographical locations: St. Louis Zimbabwe
Movements, genres, and styles: Harlem Renaissance jazz Bop