Music Publishing revenues increased by $4,565 thousand, or 26%, to $22,148 thousand for the three months ended September 30, 2021 from $17,584 thousand for the three months ended September 30, 2020. U.S. Music Publishing revenues were $10,816 thousand, or 49% of consolidated Music Publishing revenues for the three months ended September 30, 2021, and $10,058 thousand, or 57% of consolidated Music Publishing revenues for the three months ended September 30, 2020. International Music Publishing revenues were $11,332 thousand, or 51% of consolidated Music Publishing revenues for the three months ended September 30, 2021, and $7,525 thousand, or 43% of consolidated Music Publishing revenues for the three months ended September 30, 2020.
The overall increase in Music Publishing revenue during the three months ended September 30, 2021 was mainly driven by acquisitions of catalogs and revenue from the existing catalog, which led to an increase in digital revenue of $3,547 thousand or 44%, synchronization revenue of $1,340 thousand, or 48%, and other revenue of $296 thousand, or 38%. These increases were partially offset by a decrease in mechanical revenue of $131 thousand or 12% and performance revenue of $487 thousand, or 10%, which can be attributed to declines in performance and mechanical revenue across the industry due to the impact of the COVID-19 pandemic. The increase in digital revenue partially reflects the continued shift to streaming services for music consumption, while the increase in synchronization reflects the recovery in the film and television industry from the impacts of the COVID-19 pandemic.
Recorded Music revenues increased by $4,828 thousand, or 149%, to $8,073 thousand for the three months ended September 30, 2021 from $3,245 thousand for the three months ended September 30, 2020. U.S. Recorded Music revenues were $5,093 thousand and $1,426 thousand, or 63% and 44% of consolidated Recorded Music revenues for the three months ended September 30, 2021 and September 30, 2020, respectively. International Recorded Music revenues were $2,980 thousand and $1,818 thousand, or 37% and 56% of consolidated Recorded Music revenues for the three months ended September 30, 2021 and September 30, 2020, respectively.
The overall increase in Recorded Music revenue during the three months ended September 30, 2021, was driven in part by the acquisition of Tommy Boy in June 2021, which contributed $3,644 thousand to Recorded Music revenue during the three months ended September 30, 2021. Digital revenue increased by $2,991 thousand primarily due to the acquisition of Tommy Boy and due to the continued growth at music streaming services. Physical revenue increased by $1,712 thousand primarily due to an increase in physical sales at Chrysalis Records reflective of the growth in global demand for vinyl. Synchronization revenue increased by $27 thousand. Neighboring rights revenue increased by $98 thousand primarily due to the acquisition of Tommy Boy.
Six Months Ended September 30, 2021 vs. Six Months Ended September 30, 2020
Total revenues increased by $12,524 thousand, or 36%, to $47,154 thousand for the six months ended September 30, 2021 from $34,629 thousand for the six months ended September 30, 2020. Music Publishing revenues represented 73% and 84% of total revenues for the six months ended September 30, 2021 and September 30, 2020, respectively. Recorded Music revenues represented 26% and 16% of total revenues for the six months ended September 30, 2021 and September 30, 2020, respectively. U.S. and international revenues represented 53% and 47%, respectively, of total revenues for the six months ended September 30, 2021, and 56% and 44%, respectively, of total revenues for the six months ended September 30, 2020.
Total digital revenues increased by $8,378 thousand, or 48%, to $25,803 thousand for the six months ended September 30, 2021 from $17,426 thousand for the six months ended September 30, 2020. Total digital revenues represented 55% and 50% of consolidated revenues for the six months ended September 30, 2021 and September 30, 2020, respectively. The increase in digital revenue as a percentage of consolidated revenue is due to the continued growth in revenue at the music streaming services.
Music Publishing revenues increased by $5,489 thousand, or 19%, to $34,414 thousand for the six months ended September 30, 2021 from $28,925 thousand for the six months ended September 30, 2020. U.S. Music Publishing revenues were $17,670 thousand, or 51% of consolidated Music Publishing revenues for the six months ended September 30, 2021, and $16,953 thousand, or 59% of consolidated Music Publishing revenues for the six months ended September 30, 2020. International Music Publishing revenues were $16,744 thousand, or 49% of consolidated Music Publishing revenues for the six months ended September 30, 2021, and $11,972 thousand, or 41% of consolidated Music Publishing revenues for the six months ended September 30, 2020.
The overall increase in Music Publishing revenue during the six months ended September 30, 2021 was mainly driven by acquisitions of catalogs and revenue from the existing catalog, which led to increases in digital revenue of $4,288 thousand or 31%, synchronization revenue of $1,749 thousand, or 40%, and other revenue of $488 thousand, or 41%. These increases were partially offset by a decrease in mechanical revenue of $110 thousand, or 7%, and performance revenue of $927 thousand, or 12%, which can be