Misc: What continent is submerged?

Questions

Tchaikowsky's "Piano Concerto in A-flat minor" was rejected as "unplayable" by the 19th century virtuoso for whom it was written. ?

A performance by this folk-orchestra at the Paris Exhibition is said to have made a marked impression on Debussy. ?

Bach wrote a charming collection of easy piano pieces for his second wife: ?

Debussy is noted for his use of this non-traditional scale. ?

This composer was once accused of drawing on Beethoven for musical ideas. He replied "Das weisst jeder Esel" (any ass knows that). ?