useless trivia: What Word Means: Fainter?

Questions

- Abbreviation of Kochel in cataloguing Mozart's works.?

(Ger.) - Chamber. Kammerrnusik, chamber music.?

- Abbreviation of German Kontrabass, double-bass.?

(Ir. caoine) - An Irish funeral song accompanied by wailing.?

- Musical term to indicate the tonality of a piece based on the major or minor scales and their relationship between the notes of the scale and chords built around them. There are two traditional types of keys (major or minor) depending upon whether they are based on the notes of the major or minor scale.?