Have you heard of the J-pop band AAA? I'm not 100% sure how many members were there in the group, but I think they consisted of two female members and four, or maybe five, male members.  I first discovered them through their song "Wake Up!," a soundtrack of the "One Piece" anime series. I really liked the song, so I ended up searching for their other songs on YouTube. Many of their songs were really good and attracted more than 100 million views, so I assumed that they were popular in Japan. (Well, technically, I guess you have to be popular first to be considered a potential candidate for singing soundtracks for "One Piece.") On top of their great music, what really captivated me was the fact that they were a co-ed band. Even though the K-pop co-ed band KARD is pretty big now, there wasn't any co-ed K-pop band when I discovered AAA a few years ago. So it was pretty fascinating. I was actually going to ask Japanese people here if the band was still popular. But I just found out the band had announced going on indefinite hiatus last winter. Well, we all know what they meant by going on hiatus :(.  Anyway, I will always remember AAA as one of my favorite J-pop bands. https://youtu.be/wykx9MzjL-8