SchubertlineProvides on-demand transpositions. Schubertline has been publishing online scores of songs, arias and lieder for download, since 2001. The library has grown in size to over 4000 score files, covering most of the best known songs, arias and duets in the classical repertoire. The option to transpose the music into a key which best suits the voice has made this collection a valued asset for singers, teachers and accompanists.