There are several bands by this name:

— The 60's girl group most famous for «My Boyfriend's Back».

— Australian Rock Band active from the 70's through 00's. They have also been known as Angel City in the USA (although that name is also used by another artist).

— A Japanese female violin duo by the names of DJ Yumi and Naoko, known for playing violin along to electronic music (namely trance). Best known for their songs Mission (FUGA) and Angels theme (G‑Aria) for the Area 88 anime TV series in 2004.

-A Swedish band playing Adult Alternative Pop/Rock and with a 2005 release, Time is Ripe. Offering the entire album for free download at ANGELS‑Time is Ripe.

-A Croatian teen pop‑rock girl band, most known for their song «Party djevojka» and are yet to release an album

Judging by the tracks in the charts, there are possibly other artists using this name. Please add some information if you know anything about them.