| B | Data.Music.MusicXml.Pitch |
| BackSlashedNoteHead | Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| backup | Data.Music.MusicXml.Simple |
| BackwardHook | Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| bar | Data.Music.MusicXml.Simple |
| bassClef | Data.Music.MusicXml.Simple |
| beam | Data.Music.MusicXml.Simple |
| BeamType | Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| Beat | |
| 1 (Type/Class) | Data.Music.MusicXml.Time, Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| 2 (Data Constructor) | Data.Music.MusicXml.Time, Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| BeatType | |
| 1 (Type/Class) | Data.Music.MusicXml.Time, Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| 2 (Data Constructor) | Data.Music.MusicXml.Time, Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| BeginBeam | Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| beginBeam | Data.Music.MusicXml.Simple |
| beginCresc | Data.Music.MusicXml.Simple |
| beginDim | Data.Music.MusicXml.Simple |
| beginGliss | Data.Music.MusicXml.Simple |
| beginSlide | Data.Music.MusicXml.Simple |
| beginSlur | Data.Music.MusicXml.Simple |
| beginTie | Data.Music.MusicXml.Simple |
| Bend | Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| brace | Data.Music.MusicXml.Simple |
| Bracket | Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| bracket | Data.Music.MusicXml.Simple |
| BreathMark | Data.Music.MusicXml.Score, Data.Music.MusicXml, Data.Music.MusicXml.Simple |
| breathMark | Data.Music.MusicXml.Simple |