clear all;
 
%%Question 1. Part 1.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bpm = 112;
 
delta = 0.00005;
 
%%Note lengths.
half = [0:delta:120/bpm];
quart = [0:delta:60/bpm];
eighth = [0:delta:30/bpm];
dotquart = [0:delta:90/bpm];
 
%%Note Frequencies.
gfreq = 2^(-2/12)*440;
bffreq = 2^(1/12)*440;
cfreq = 2^(3/12)*440;
dffreq = 2^(4/12)*440;
 
%%Notes
G = sin(2*pi*gfreq*quart);
Bf = sin(2*pi*bffreq*quart);
Cdq = sin(2*pi*cfreq*dotquart);
Df = sin(2*pi*dffreq*eighth);
Ch = sin(2*pi*cfreq*half);
 
%%Song
song = [G, Bf, Cdq, G, Bf, Df, Ch, G, Bf, Cdq, Bf, G];
 
sound(song, 1/delta)
wavwrite(song, 1/delta, '112bpm.wav')
pause(1);
 
 
%%Question 1. Part 2.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bpmfast = 224;
 
%%Note lengths.
half = [0:delta:120/bpmfast];
quart = [0:delta:60/bpmfast];
eighth = [0:delta:30/bpmfast];
dotquart = [0:delta:90/bpmfast];
 
%%Notes
G = sin(2*pi*gfreq*quart);
Bf = sin(2*pi*bffreq*quart);
Cdq = sin(2*pi*cfreq*dotquart);
Df = sin(2*pi*dffreq*eighth);
Ch = sin(2*pi*cfreq*half);
 
%%Fast Song
fastsong = [G, Bf, Cdq, G, Bf, Df, Ch, G, Bf, Cdq, Bf, G];
 
sound(fastsong, 1/delta)
wavwrite(fastsong, 1/delta, '224bpm.wav')
pause(1);
 
%%Question 1. Part 3.%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
bpm = 112;
 
delta = 0.00005;
 
%%Note lengths.
half = [0:delta:120/bpm];
quart = [0:delta:60/bpm];
eighth = [0:delta:30/bpm];
dotquart = [0:delta:90/bpm];
 
%%Note Frequencies.
gfreq = 2^(-2/12)*440;
bffreq = 2^(1/12)*440;
cfreq = 2^(3/12)*440;
dffreq = 2^(4/12)*440;
 
%%Notes
G = sin(4*pi*gfreq*quart);
Bf = sin(4*pi*bffreq*quart);
Cdq = sin(4*pi*cfreq*dotquart);
Df = sin(4*pi*dffreq*eighth);
Ch = sin(4*pi*cfreq*half);
 
%%Song
highsong = [G, Bf, Cdq, G, Bf, Df, Ch, G, Bf, Cdq, Bf, G];
 
sound(highsong, 1/delta)
wavwrite(highsong, 1/delta, 'highpitch.wav')
 
%%Combining all songs into one.
combined = horzcat(1, song, fastsong, highsong);
 
wavwrite(combined, 1/delta, 'combined.wav')

%%Question 2. %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 
[Beatles, fs, N] = wavread('Beatles.wav');
RevBeatles = flipud(Beatles);
sound(RevBeatles, fs)
wavwrite(RevBeatles, fs, N, 'seltaeB.wav');