Misc: What 42 year old Panamanian boxer won his 89th pro fight in 1993?

Questions

(It.) - By, through, for (e.g. per archi, for strings).?

(It., 'losing itself') - Gradually dying away.?

- A cadence with the chord progression consisting of the dominant (chord V) to the tonic (chord I) which has a 'complete' sound.?

- These are the intervals of the octave, fourth and fifth.?

- A sense of pitch which enables a person to identify a note simply by hearing it.?