MusicXML has been transfered to the W3C in July 2015 and there is now a music notation community group: https://www.w3.org/community/music-notation/ https://www

MusicXML has been transfered to the W3C in July 2015 and there is now a music notation community group: https://www.w3.org/community/music-notation/ https://www.w3.org/community/music-notation/ So it's becoming a standard. As their new year message (https://www.w3.org/community/music-notation/2015/12/10/2015-year-end-update/ https://www.w3.org/community/music-notation/2015/12/10/2015-... ) says: "we look forward ... to start more extensive work on an updated web music notation format for the future."