What is the definition of the musical term key

In music theory, the key of a piece is the group of pitches, or scale that form the basis of a music composition in classical, Western art, and Western pop music.

In music theory, the key of a piece is the group of pitches, or scale that form the basis of a music composition in classical, Western art, and Western pop music. ... Notes and chords other than the tonic in a piece create varying degrees of tension, resolved when the tonic note or chord returns.

Howard ruffo  makes the reader feel that ellery has misidentified who is responsible for committing the crime and will end up feeling embarrassed.

For #1 i believe the answer would be d. because it is hard to perfect thatfor #3 i believe the answer would be b. because latin root meaning round  for #6 i believe the answer would be a. because it is a jewish thing