Timeline of trends in music (1900-1909)
- Music of Tanzania
- The Ikhwani Safaa Musical Club is founded; this is sometimes considered the birth of modern taarab
- International trends
- Ferruccio Busoni's essay "Entwurf einer neuen Aesthetic der Tonkunst" explains his unusual harmonic ideas, and is perhaps the earliest prediction of the development of electronic music
- Music of Mexico
- General Porfirio Díaz legendarily orders a mariachi band to wear upper-class clothing (a charro suit) when they played for the visiting United States Secretary of State; this is the beginning of modern mariachi, as well as the traditional dress of future mariachi stars
- Music of the United States