A+ = excellent SBD recording. Includes FM broadcasts
and exceptional TV broadcasts.
A = good soundboard recording or exceptional audience recording
(there are some that can be hardly deferentiated from boards)
A- = good audience or older SBD recordings
B+ = standard grade for audience recordings and higher generation
copies of SBD recordings.
B = for collectors only, mediocre quality audience recording
B- = rather crappy, for die hards only
I only use Verbatim, Ricoh and Sony CDR's or DVD's.