ipd.display( ipd.YouTubeVideo("2A6ZXZwl3nA", start=106) )

"""
Explanation: &larr; Back to Index
Symbolic Representations
Symbolic music representations comprise any kind of score representation with an explicit encoding of notes or other musical events. These include machine-readable data formats such as MIDI. Any kind of digital data format may be regarded as symbolic since it is based on a finite alphabet of letters or symbols.
Piano-Roll Representations
Around the late 19th and early 20th centuries, self-playing pianos called player pianos became popular. The input for these pianos is a continuous roll of paper with holes punched into it. This paper roll is called a piano roll. Performances by famous musicians such as Gustav Mahler, Edvard Grieg, Scott Joplin and George Gershwin have been recorded onto piano rolls. 
Similar to the player piano, the pianola is not a player piano but it sits in front of a piano. Here is a pianola in action:
End of explanation
"""


ipd.display( ipd.YouTubeVideo("LlvUepMa31o", start=15) )

ipd.display( ipd.YouTubeVideo("Kri2jWr08S4", start=11) )

"""
Explanation: Today, a piano-roll representation generically refers to any visualization of note information resembling a piano roll. See below for examples of piano-roll representations by Stephen Malinowski. Here, the horizontal axis represents time, and the vertical axis represents pitch.
End of explanation
"""


