# Lesson 3

# In this lesson, you will write code to create
# half steps and whole steps. You will also
# practice debugging: fixing lines of code that
# have mistakes in them.

# General Instructions:
#
# This lesson contains three examples and four
# exercises (A, B, C, D).
#
# To listen to an example, change "comment"
# to "uncomment" on the "comment do" line,
# then click the "Run" menu command at the
# top of the Sonic Pi editor window.
# When you are done with the example, turn
# it off by changing "uncomment" back to
# "comment," and move on to the next section
# of the lesson.
#

# Half Steps: On a piano keyboard, a half step
# is the distance between any two adjacent notes.
# For example:
#   white-white (B->C, E->F)
#   white-black (C->C#)
#   black-white (G#-A)
# In Sonic Pi, a half step is the distance
# between any two adjacent note numbers, or two
# adjacent letter names.

# Example 1:
comment do
  play 60
  sleep 0.5
  play 61       # play up one half step
  sleep 0.5
  play 60       # play down one half step
end

# Example 2:
comment do
  play :C4
  sleep 0.5
  play :Cs4       # play up one half step
  sleep 0.5
  play :C4       # play down one half step
end

# Exercise A - copy and paste Example 1 code
# into the space below this paragraph. Change
# the code so that the pattern continues
# to move up in half steps, starting
# on note 60 and ending on note 72.





# Exercise B - copy and paste Example 2 code
# into the space below this paragraph. Change
# the code so that the pattern moves down
# in half steps, starting with :C5 and ending
# on :C4.





# Whole Steps. Whole steps are = two half steps.
# In Sonic Pi, a series of whole steps can be
# written as a series of odd numbers or a series
# of even numbers. Whole steps can also be
# written as letter names two half steps apart.

# Example 3 - whole steps:

comment do
  play :C4
  sleep 1
  play :D4
  sleep 1
  play :E4
  sleep 1
  play :Fs4
  sleep 1
  play :Gs4
  sleep 1
  play :As4
  sleep 1
  play :C5
end

# Exercise C - change the letter names in
# Example 3 to numbers, without changing the
# sounding pitches. The first letter name
# (:C4) = 60. Your code should be written
# as a series of ______ numbers (odd/even?)
# and the resulting sound should be an ascending
# whole-tone scale (series of whole steps
# going up).




# Exercise D - Debugging. The following sample
# code has some errors in it. Find and correct
# all of the errors. Do you recognize the tune
# (after fixing the errors)?

comment do
  use_bpm100
  play:E4
  slleep 1
  play :D4
  sleep 1
  play C4
  sleepp 1
  play :D4
  sleep 1/2
  play :E4
  sleep 1
  play :E4
  leep 1
  play :E4
  sleep 2
end