125_bounce.wav                  jangle_pop.mp3
58bpm.wav                       latin_groove.mp3
README.md                       oboe_c6.wav
brahms_hungarian_dance_5.mp3    prelude_cmaj.wav
busta_rhymes_hits_for_days.mp3  simple_loop.wav
c_strum.wav                     simple_piano.wav
clarinet_c6.wav                 sir_duke_piano_fast.mp3
classic_rock_beat.wav           sir_duke_piano_slow.mp3
conga_groove.wav                sir_duke_trumpet_fast.mp3
drum_samples/                   sir_duke_trumpet_slow.mp3
funk_groove.mp3                 tone_440.wav
X = librosa.stft(x)
Xdb = librosa.amplitude_to_db(abs(X))
plt.figure(figsize=(14, 5))
librosa.display.specshow(Xdb, sr=sr, x_axis='time', y_axis='hz')
sr = 22050 # sample rate
T = 2.0    # seconds
t = numpy.linspace(0, T, int(T*sr), endpoint=False) # time variable
x = 0.5*numpy.sin(2*numpy.pi*440*t)                # pure sine wave at 440 Hz