Random music pimping, woo! This is Japanese rock band The Yellow Monkey. Lovin, Emma, Heesey, and Annie. ♥ Not their real names, of course, but that is what they went by at the time. They’re one of my favorite bands, but they stopped activities in 2001 and officially disbanded in 2004.
Most people know them because they did a song in Rurouni Kenshin (Tactics), but I really wish people would look into them more than that. :| Tactics is definitely not their best song.
The Yellow Monkey - 聖なる海とサンシャイン
The Yellow Monkey - BURN