Slowly We Rot is the debut album by American death metal band Obituary. It was released on May 16, 1989 and is the only album on which Obituary used E standard guitar tuning, as opposed to the D standard tuning used on all their other albums.[citation needed] Despite this, it is widely considered to be Obituary's heaviest album.[citation needed] Slowly We Rot is the only Obituary album to feature bassist Daniel Tucker, guitarist Allen West would leave soon after but returned for the third album The End Complete.