"It also helps to know that back left is usually where the bass drum is."
Not entirely true all the time. Some examples of the bass timpanis on the right rear of the soundstage are :
Beethoven Symphony No.1 Karajan BPO 1961/2 cycle on DGG
Beethoven Piano Concerto No.5 Stephen Bishop, Colin Davis, LSO on Philips
Not entirely true all the time. Some examples of the bass timpanis on the right rear of the soundstage are :
Beethoven Symphony No.1 Karajan BPO 1961/2 cycle on DGG
Beethoven Piano Concerto No.5 Stephen Bishop, Colin Davis, LSO on Philips