Editing Density 21.5 (section)

{{italic title}}
'''''Density 21.5''''' is a composition for solo [[Western concert flute|flute]] written by [[Edgard Varèse]] in 1936 and revised in 1946. The piece was composed at the request of [[Georges Barrère]] for the premiere of his [[platinum]] flute,{{efn|1=The flute was a 90/10 [[platinum-iridium alloy]] with a density of about 21.6 grams per cubic centimetre. It cost US$3,750 in 1935, about US$65,000 in 2014 dollars. The flute was manufactured by [[William S. Haynes|Haynes Flutes]]. See {{harvnb|Anon.|1941}}, {{harvnb|Anon.|2018}}, and [http://data.bls.gov/cgi-bin/cpicalc.pl?cost1=3750&year1=1935&year2=2014 US CPI Inflation Calculator] {{Webarchive|url=https://web.archive.org/web/20160304193914/http://data.bls.gov/cgi-bin/cpicalc.pl?cost1=3750&year1=1935&year2=2014 |date=2016-03-04}}}} the [[density]] of platinum being close to 21.5 grams per cubic centimetre.{{sfn|Chou|1994}}