Fuseduletecil
The issue of the earliest use of trombone glissando in classical music has been thoroughly treated in:
Trevor Herbert, "Trombone Glissando: A Case Study in Continuity and Change in Brass Instrument Performance Idioms, Historic Brass Society Journal, Vol. 22, 2012. pp. 1-18
It can no longer be said that Schoenberg's use of trombone glissando was the first - or even one of the earliest - use of the trombone glissando in classical music, with works by Glazunov (The Sea, 1889), Elgar (Dream of Gerontius, 1899), and Rimsky Korsakov (Mlada, 1892), all of which predated Pelleas. Fuseduletecil (talk) 16:25, 17 June 2016 (UTC)
Wikipedia and Copyright
editHi Fuseduletecil, regarding Draft:Nathaniel Cleophas Davis if you own the copyright to the source you want to copy or are a legally designated agent, you may be able to license that text so that we can publish it here. Understand, though, that unlike many other sites, where a person can license their content for use there and retain non-free ownership, that is not possible at Wikipedia. Rather, the release of content must be irrevocable, to the world, into the public domain (PD) or under a suitably-free and compatible copyright license. Such a release must be done in a verifiable manner, so that the authority of the person purporting to release the copyright is evidenced. See Wikipedia:Donating copyrighted materials. ~ Amkgp 💬 15:44, 12 July 2020 (UTC)