It's interesting (to me at least), that whilst 'grunge' and post- MOR Rock bands (Pearl Jam, Nirvana, Alice in Chains, Stone Temple Pilots, Mudhoney etc.) started having success in the late '80s & early '90s, a very different scene was happening in the UK, with bands like Primal Scream, Belle & Sebastian, Talk Talk, The Chameleons, World of Twist etc. and 'Madchester' / 'baggy' bands like The Stone Roses, Inspiral Carpets, Happy Mondays etc.
The big American bands get remembered as defining the late '80s / early '90s, but I'm not sure that they really did - some of the British music from this era was pretty influential too.
Other albums released in September 1991:
Primal Scream - Screamadelica (23/9/91);
Saint Etienne - Foxbase Alpha (16/9/91);
Talk Talk - Laughing Stock (19/9/91);
Orbital - Orbital (30/9/91);
and last, but definitely least...
Simply Red - Stars (30/9/91)!!!!!!