AceShowbiz - When a group who has split up or taken a long hiatus makes their comeback after so long, it's only natural for fans to go crazy about it. And that's exactly what happened to Jonas Brothers fans when the three-piece band released their first single in late last month after nearly six years of split.

Entitled "Sucker", the single debuted at No. 1 on Billboard's Hot 100 chart and the U.S. Hot Digital Songs chart, with 88,000 copies sold in its first week. It marked the band's first No. 1 single in the country and helped them become the second group in a lead role in history to have a song debuted at No. 1 after Aerosmith's "I Don't Want to Miss a Thing".

Making fans more excited, Jonas Brothers recently teased that "Sucker" wouldn't be the only new song that fans get to listen. Joe Jonas said that the band had "probably 30, 40 songs recorded that we can't wait to release," while Kevin Jonas promised that there would be "so much more to come." Meanwhile, Nick Jonas hinted that the band would be going on a tour as saying, "So hopefully later on this year, we'll get back out on the road and play some of this new music."

Jonas Brothers isn't the only band whom fans have been hoping to get back together. We have listed several music groups whose reunions have been anticipated the most by die hard fans, so let's take a look!