
1) Composer 2) Finnish composer 3) Jean sibelius 4) Source of the quote 5) The Swan of Tuonela composer
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https://www.crosswordclues.com/clue/sibelius

1) Finn
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https://www.crosswordclues.com/clue/sibelius
[software] Sibelius is a WYSIWYG scorewriter program, created by Sibelius Software (now part of Avid Technology) for Microsoft Windows, Mac OS X, and historically RISC OS. It is used by composers, arrangers, performers, music publishers, teachers and students, particularly for writing classical, jazz, band, vocal, film and television music....
Found on
http://en.wikipedia.org/wiki/Sibelius_(software)

Brand name for the most well known form of music notation software (software which transposes what is played into a musical score). Also a dead Scandinavian composer!
Found on
http://www.traditionalmusic.co.uk/music%20tech%20glossary/Music%20Tech%20Gl

[
n] - Finnish composer (1865-1957)
Found on
http://www.webdictionary.co.uk/definition.php?query=Sibelius
Jean Sibelius noun Finnish composer (1865-1957)
Found on
https://www.encyclo.co.uk/local/20974
No exact match found.