| label | Euterpea.IO.MUI, Euterpea |
| LayoutType | Euterpea.IO.MUI, Euterpea |
| LazyDur | Euterpea.Music.Note.MoreMusic, Euterpea |
| lc | Euterpea.Examples.RandomMusic |
| lcl | Euterpea.Examples.RandomMusic |
| Lead1Square | Euterpea.Music.Note.Music, Euterpea |
| Lead2Sawtooth | Euterpea.Music.Note.Music, Euterpea |
| Lead3Calliope | Euterpea.Music.Note.Music, Euterpea |
| Lead4Chiff | Euterpea.Music.Note.Music, Euterpea |
| Lead5Charang | Euterpea.Music.Note.Music, Euterpea |
| Lead6Voice | Euterpea.Music.Note.Music, Euterpea |
| Lead7Fifths | Euterpea.Music.Note.Music, Euterpea |
| Lead8BassLead | Euterpea.Music.Note.Music, Euterpea |
| left | Euterpea |
| leftApp | Euterpea |
| LeftPizz | Euterpea.Music.Note.Music, Euterpea |
| leftRight | Euterpea.IO.MUI, Euterpea |
| Legato | Euterpea.Music.Note.Music, Euterpea |
| legato | Euterpea.Examples.SSF |
| LFun | Euterpea.Examples.LSystems |
| lhs | Euterpea.Examples.LSystems |
| liftAIO | Euterpea.Experimental |
| line | |
| 1 (Function) | Euterpea.Music.Note.MoreMusic, Euterpea |
| 2 (Function) | Euterpea.IO.Audio.CSound |
| line1 | Euterpea.Music.Note.MoreMusic, Euterpea |
| linear | System.Random.Distributions |
| linearCP | Euterpea.ExperimentalPlay |
| linen | Euterpea.IO.Audio.CSound |
| lineSeg1 | Euterpea.IO.Audio.CSound |
| lineToList | Euterpea.Music.Note.MoreMusic, Euterpea |
| linseg | Euterpea.IO.Audio.CSound |
| listbox | Euterpea.IO.MUI, Euterpea |
| loadMidiFile | Euterpea.Examples.EuterpeaExamples |
| LongGuiro | Euterpea.Music.Note.MoreMusic, Euterpea |
| LongWhistle | Euterpea.Music.Note.MoreMusic, Euterpea |
| loop | Euterpea |
| Loudness | Euterpea.Music.Note.Music, Euterpea |
| LowAgogo | Euterpea.Music.Note.MoreMusic, Euterpea |
| LowBongo | Euterpea.Music.Note.MoreMusic, Euterpea |
| LowConga | Euterpea.Music.Note.MoreMusic, Euterpea |
| LowFloorTom | Euterpea.Music.Note.MoreMusic, Euterpea |
| LowMidTom | Euterpea.Music.Note.MoreMusic, Euterpea |
| LowTimbale | Euterpea.Music.Note.MoreMusic, Euterpea |
| LowTom | Euterpea.Music.Note.MoreMusic, Euterpea |
| LowWoodBlock | Euterpea.Music.Note.MoreMusic, Euterpea |
| LSys | Euterpea.Examples.LSystems |
| Lyrics | Euterpea.IO.MIDI.MidiIO, Euterpea.IO.MIDI, Euterpea |