This band is pop/alternative/rock
The lead singer has long hair

Throughout the video they are dancing and it transitions from place to place
In the end they end up in a field and they are like play fighting or something
Everyone has paint
Possibly painted faces

Sounds similar with Michael Jackson's Black or white. But I don't think it is, I am not sure because everyone know who Michael is so you would have known too. With your description this is the only one that popped up on My head. Hope u find it soon. :)