UnScramble this Word: i k l s e t c?

Questions

Duets - Brandy and ______________ had a No.1 with 'The Boy Is Mine' in 1998?

Duets - Who was Puff Daddy's duet partner on 'I'll Be Missing You' in 1997?

Duets - Who was Michael Jackson's duet partner on ' I Just Can't Stop Loving You'?

The early music of the medieval church existed in the form of Gregorian chants. These chants are monophonic and?

The unique sound of medieval music, sacred and secular, stems from the unusual scales used. These scales are called:?