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For me, the most famous musical instrument is the Guitar. or string musical instruments.
Desi Arnaz
they were famous for writing the letters
Piano
He was famous for writing minuets
The paraguayan harp is the most famous instrument of Paraguay, many local artists have been internationally recognized.
guitar
Piano
Didgeridoo
Bagpipes
He is most famous for writing the Lord of the Rings.
He is famous for writing music.