What's a band that you like that was gone way too soon?
For example, a band like Joy Division. Two masterpiece albums in the form of Unknown Pleasures and Closer, and the untimely death of Ian Curtis cut it all short. They were even heading into the direction that New Order eventually went in, and it would have been interesting to see what Ian Curtis would have done if they fully made the leap into electronic music while he was still alive.
I just took a gander over to Wikipedia to learn why they broke up. It was there where I read one of the best break up write ups ever:
"During the tour for Spilt Milk, Sturmer and Manning grew increasingly distant as friends. On their return home, the two songwriters independently wrote material for a third album, provisionally titled Nausea Trois. By then, they were drifting apart musically. Manning remembered that, prior, they would bond over albums such as Paul McCartney's Ram or the Zombies' Odessey and Oracle; however, "it was clear that none of that was happening anymore." He said that he was "rediscovering my love of [...] high-energy, fun melodic pop with attitude. And Andy was Leonard Cohen. That was it." When Sturmer presented him a country ballad song, he accordingly "left in tears because I had zero interest in recording it." Sturmer felt that Manning had outgrown the partnership, and for his part, was fearful that Manning's new songs would likely inspire journalists to persistently compare the band to Alice Cooper."
Also...In 2004 or 2005, Coachella organizers invited Manning to reunite Jellyfish for a one-off performance at the festival. Manning advised the organizers to consult Sturmer first. Sturmer, through his lawyer, responded he would not accept the offer regardless of any amount of money involved.