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http://www.radioelektrola.com/encyclopaedia.htm
http://www.blocosonline.com.br/literatura/poesia/pn/pn001052.htm
fiberonline
http://www.uol.com.br/fiberonline/musica/johann_heyss.htm
london burning
http://website.lineone.net/~luciano.vianna/johann.html
approximately infinite universe: http://www.kaapeli.fi/aiu/share_piece.html
http://www.novamusica.com.br/cgi-bin/artista.cgi?musico_id=78
http://www.record.com.br/novaera/releases/058008.htm