The Avalanches - Since I Left You: What's painful about the lack of a follow-up to 2000's cult classic Since I Left You - a disco-pop gem which contains an estimated 3,5000 samples from pretty much anything that's ever emitted a noise - is that they've supposedly been working on its follow-up since 2005. It's just not going to happen.
Arthur Russell - World Of Echo: Russell was chronically indecisive, almost never satisfied enough with his recordings to release them. As a result, only one album made it into the public sphere while he was alive - World Of Echoes. After his death, much of his work was posthumously released, and his legacy as one of the most forward-thinking avant-garde musicians thrived.
The Postal Service - Give Up: Perhaps now Ben Gibbard (one half of The Postal Service) has left Death Cab For Cutie, he and Jimmy Tamborello can get recording a follow-up to 2003's Give Up, an album of synthy indie-pop which hearkened back to '80s new wave before hearkening back to '80s new wave was cool.
Madvillain - Madvillainy: The supervillain-themed concept album by Madvillain - one of the many collaborative projects of the elusive MF Doom, this time with producer Madlib - is 22 tracks of profound, funny, strange lyrical gymnastics. It's one of the best hip hop records ever made.
Jeff Buckley - Grace: The only album Jeff Buckley recorded during his lifetime was met with poor sales and mixed reviews upon its initial release. Over the years following his death at the age of 30 in 1997, both critics and fans reassessed his work, and realised how painfully wrong they had been.
Jackson C. Frank - Jackson C. Frank: After travelling to England with big dreams, the US folk musician released one self-titled album in 1965, and it was largely ignored. In the years that followed, he battled paranoid schizophrenia, was shot in the eye and blinded by a child with a pellet gun, ending up homeless for many years and died of pneumonia at the age of 56. After his death, his music - which includes 'Blues Run The Game' and 'My Name Is Carnival' - gained the recognition it deserved.
Them Crooked Vultures - Them Crooked Vultures: Lightning doesn't often strike in the same place twice, so it's not surprising that this rock supergroup - comprising Foo Fighters' Dave Grohl, Queens Of The Stone Age's Josh Homme and Led Zeppelin's John Paul Jones - never followed up their self-titled debut album. They're busy people, after all.
American Football - American Football: The band's one and only album gained cult status through word of month over the nearly 20 years since its release. It's only nine tracks long, but the deluxe edition includes a further ten tracks from live shows and practice sessions, which the band never got round to recording.
Monsters Of Folk - Monsters Of Folk: OK, so the name Monsters Of Folk is somewhat nauseating (side note - if you Google image search Monsters Of Folk, Mumford & Sons come up. Because they are literal monsters of folk?), but this supergroup, comprising Conor Oberst, M. Ward, Jim James and Mike Mogis, is even greater than the sum of its impressive parts.
Operation Ivy - Energy: The 1989 album has been cited as one of the most important ska punk albums of all time, and its release seen as a pivotal moment for ska-core. They broke up the same year that their debut album was released, and never made another album.
The La's - The La's: It took quite a while, and several aborted studio sessions with different producers, for The La's to get even one album made. Thank God they did though, because their music has been cited as an influence by the likes of Oasis, Paul Weller, The Libertines and The Charlatans.