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.
The Eighties Matchbox B-Line Disaster
Their second album, Rise of the Eagles is amazing, but their lead guitarist left, they didn’t make an album for another 7 years, and by then, it was too late :/
I also like The Cooper Temple Clause, but their third album after the bassist (Didz Hammond) left to do other stuff was shit, with a couple of decent tracks. Then they broke up.