According to medieval Catholic teachings, what was the intermediate realm where Christians were punished for repented sins that had not been expiated before their deaths?

What type of accompaniment is the double bass providing during this selection?

a. Bowed (arco) long tones b. Double-stops c. Walking bass line d. Repeating bass figure

What is the major key represented by this key signature?

A. Gb B. Eb C. C D. Db E. F