OK All the links I have inserted where to high definition public domain recordings In some cases I agree there were similar ones already on the page But in other cases there was nothing of comparable quality For example on  Coriolan Overture httpenwikipediaorgwikiStringQuartetNoBorodin  httpenwikipediaorgwikiPianoSonatainEflatmajorDSchubert  httpenwikipediaorgwikiSymphonyNoTchaikovsky  httpenwikipediaorgwikiStringQuartetNoMozart  httpenwikipediaorgwikiStringQuartetNoMozart  httpenwikipediaorgwikiPianoSonatainDmajorDSchubert  httpenwikipediaorgwikiPianoSonatainAminorDSchubert  there is nothing of comparable quality on these So how come I cannot post links to public domain youtube HD recordings in these cases  All the best