Simplify the following text for a Grade 7 native English-speaking person.
Original: Piccinni remained popular , and on the death of Gluck , in 1787 , proposed that a public monument be erected to his memoryâ '' a suggestion which the Gluckists refused to support .
Simplified: But Piccinni continued to be popular . When Gluck died , in 1787 , Piccinni suggested that a public monument should be built to his memory .