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SPEAKER 1: Let's take a look at bday.

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In this problem, here are the things
that you're going to need to do.

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First, we'll give you the sheet
music for the song Happy Birthday.

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And using your
understanding of sheet music

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and what each of the lines and
spaces between the lines mean

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and how long each note lasts, you'll
figure out what notes are being played

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and how long they're going to last.

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And finally, you're going to write down
the ASCII representation of those notes

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in a file called bday.txt.

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We'll show you in a
moment a format whereby

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you can represent notes
and their occidentals

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and their octave and their length
all in a text-based format.

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So let's take a look at that format now.

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Here's some ways that we would
represent notes as ASCII text.

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If I had a line that looked like
C4@1/8 the interpretation of this

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is the note is C, it's
in the fourth octave,

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and everything after the at
sign is how long that it lasts,

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and one-eighth means
it's an eighth note.

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So that's C4@1/8.

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If we want to represent
a note with occidentals,

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we could include that in this
text-based representation as well.

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For example, C#4@1/8 means this is the
note C#, also on the fourth octave,

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and it's also an eighth note.

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And finally, if we wanted to
represent a flat note, for example,

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we might do C flat four, where the flat
is just represented by the lowercase b

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ASCII character--

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Cb4@1/4 which would be C flat in the
fourth octave, but this time a quarter

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note instead of an eighth note
where a quarter note if you recall,

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is twice as long as an eighth note is.

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And using this representation,
we have the ability

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to represent sheet music
just using the characters

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that we have on our keyboard.

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And so a sequence of notes
might look something like this.

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Right here, we have it D
in the fourth octave which

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is going to be an eighth note, followed
by F sharp in the fourth octave which

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is going to be a quarter note, followed
by A in the fourth octave which is also

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a quarter note.

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And that blank line just
means that we're going

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to rest for an eighth note length.

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In other words, there's going to
be no sound for a period of time

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equal to one eighth note.

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And then following that
blank line, we have

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D in the fifth octave being played
for the length of one eighth note.

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And so using this representation,
we have the ability

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to represent songs using just text.

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So your task now doesn't actually
require you to write any code,

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but all you'll need to do is take a look
at the sheet music for Happy Birthday,

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figure out what notes are being played,
and then turn that into that text-based

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representation of notes where
each note gets its own--

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that's the note, followed by
an occidental if it has it,

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followed by an octave number,
followed by the at sign, followed

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by the length of that note where
one over eight is an eighth note,

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one over four is a quarter note, and one
over two is a half note for instance.

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Put all of that in a file called
bday.txt, and you're done.

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And that's bday.

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