Each band is assigned a rating from 1 to 5, with 1 denoting the weakest groups and 5 signifying the very best.
From there each album receives a rating between 0 and 10, to which the band rating is added to give the record its overall grade.
Here is a brief representation of what each grade means:
This band rating system, along with the meanings of the grades (save my addition of consummate effluvia), were lifted directly from George Starostin's site, my primary influence when creating this page.