I was curious about the composition of music, therefore a friend and I created frequency-domain visualizations of interesting sounds using the Welch power spect

I was curious about the composition of music, therefore a friend and I created frequency-domain visualizations of interesting sounds using the Welch power spectral density estimation algorithm and Fast Fourier Transform. A few examples: 1. Dialtone using dual-tone multi-frequency signaling and 56K dial-up modem connection: https://www.youtube.com/watch?v=FomWraKuDFg&list=PLn67ccdhCssEJsJE6BnAqqBCDIdQHPFQb https://www.youtube.com/watch?v=FomWraKuDFg&list=PLn67ccdhCs... 2. Deluxe Multitone Car Alarm: https://www.youtube.com/watch?v=A4uKcvZL7HM&list=PLn67ccdhCssEJsJE6BnAqqBCDIdQHPFQb https://www.youtube.com/watch?v=A4uKcvZL7HM&list=PLn67ccdhCs... 3. Composition using only sounds from Windows 98 and XP https://www.youtube.com/watch?v=6lT-jr9sS6Y&list=PLn67ccdhCssEJsJE6BnAqqBCDIdQHPFQb https://www.youtube.com/watch?v=6lT-jr9sS6Y&list=PLn67ccdhCs... 4. Piano Music (Ballade Pour Adeline): https://www.youtube.com/watch?v=RnAfrEk429w&list=PLn67ccdhCssHTboc1l6tK_j-16u9Z3G_8&index=1 https://www.youtube.com/watch?v=RnAfrEk429w&list=PLn67ccdhCs... 5. Electronic Music Demo: https://www.youtube.com/watch?v=MllJLIX1glg&list=PLn67ccdhCssHLdXIUHHNVaO-N8fCY_Wi5&index=1 https://www.youtube.com/watch?v=MllJLIX1glg&list=PLn67ccdhCs...