{"action":"closed","issue":{"url":"https://api.github.com/repos/cuthbertLab/music21/issues/125","labels_url":"https://api.github.com/repos/cuthbertLab/music21/issues/125/labels{/name}","comments_url":"https://api.github.com/repos/cuthbertLab/music21/issues/125/comments","events_url":"https://api.github.com/repos/cuthbertLab/music21/issues/125/events","html_url":"https://github.com/cuthbertLab/music21/issues/125","id":121999212,"number":125,"title":"MEI transposition information of instruments not parsed","user":{"login":"sonovice","id":8217108,"avatar_url":"https://avatars.githubusercontent.com/u/8217108?v=3","gravatar_id":"","url":"https://api.github.com/users/sonovice","html_url":"https://github.com/sonovice","followers_url":"https://api.github.com/users/sonovice/followers","following_url":"https://api.github.com/users/sonovice/following{/other_user}","gists_url":"https://api.github.com/users/sonovice/gists{/gist_id}","starred_url":"https://api.github.com/users/sonovice/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sonovice/subscriptions","organizations_url":"https://api.github.com/users/sonovice/orgs","repos_url":"https://api.github.com/users/sonovice/repos","events_url":"https://api.github.com/users/sonovice/events{/privacy}","received_events_url":"https://api.github.com/users/sonovice/received_events","type":"User","site_admin":false},"labels":[],"state":"closed","locked":false,"assignee":null,"milestone":null,"comments":13,"created_at":"2015-12-14T08:53:23Z","updated_at":"2016-01-24T17:26:52Z","closed_at":"2016-01-24T17:26:52Z","body":"It seems like the transposition information of instruments in an MEI file are not parsed.\r\nTrying to get the actual sounding pitch of the notes always results in `music21.exceptions21.StreamException: atSoundingPitch is unknown: cannot transpose`\r\n\r\nThe MEI file does include the transpositions in a correct manner, for example `trans.semi=\"-7\"`.\r\n\r\nMinimal example:\r\n```python\r\nstream = converter.parseFile('Hummel_Concerto_for_trumpet.mei', None, \"mei\", True)\r\nstream.toSoundingPitch(inPlace=True)\r\n```\r\n\r\nThe MEI file used: [Hummel Concerto](http://www.verovio.org/examples/downloads/Hummel_Concerto_for_trumpet.mei)"}}