Chamber, a chamber choir is a group of 5 to 6 people that sing music of a certain genre
Ragtime is usually defined as a song that is in 2/4 time or 4/4 time people usually get it confused with 3/4 time however that is considered a ragtime waltz. Ragtime is used by taking the base line and using progressive harmonic chords that may be punch or silent while the melody is carried out through the Alto,Soprano lines as it uses syncopation which makes the song being played off beat and unexpected. It's related to jazz by the fact that Jazz itself rather replaced Ragtime due to the rising amount of bands that added a unique style to the ragtime with a 70+ BPM and usually included it in many records.
Depends on the music. The most popular ones include timpani, triangle, cymbals, snare drum, bass drum
mood is the feeling that the author is trying to show in the story kinda like emotions.