Z-1 was a Japanese idol quartet signed under Toshiba EMI from 1999 to 2002. The name Z-1 signifies the last (Z) super stars of the 20th century and the first (1) of the 21st.
These are photos from concerts where Z-1 played, so they may be of other bands that played the concert as well.
AudioFarm Festival 2021 Sep 2 - 7, 2021 Cleobury Mortimer, England, United Kingdom Uploaded by Aesthete