Based on:  http://fritzing.org/projects/blinking-leds-to-frequency-of-music   Many thanks to isaackoz and dwang4!   This just cleans up the breadboard a bit and provides links to all parts.

See external links to previous Fritzing and Instructable for further details and instructions.

 

Parts I used (all prices approximate $USD as of 2016-04-04):

  1. Arduino Uno: $3 http://www.aliexpress.com/item/Best-prices-UNO-R3-MEGA328P-for-Arduino-Compatible-Free-Shipping-Dropshipping/32213964945.html
  2. Audio jack: $1 http://www.aliexpress.com/item/10pcs-3-5mm-Stereo-Jack-Socket-Audio-Jack-Connector-PCB-3F07-5PIN-Green/32369596399.html
  3. 12V DC 5A power supply: $8 http://www.aliexpress.com/item/AC100V-110V-210V-220V-230V-to-DC12V-1-8A-Led-Light-Switch-Power-Supply-Charger-Transformer/32554615623.html
  4. Capacitor C1 33pF: $1 http://www.aliexpress.com/item/100pcs-lot-Multilayer-ceramic-capacitor-330-50V-30pF-330J/32426927318.html
  5. Capacitors C2 & C4 100nF: $1 http://www.aliexpress.com/item/100pcs-lot-Multilayer-ceramic-capacitor-0-1uF-104-50V-100nF-104M/32429917283.html
  6. Capacitor C3 10nF: $1 http://www.aliexpress.com/item/100pcs-lot-Multilayer-ceramic-capacitor-103-50V-10nF-103M/32431355082.html
  7. Resistors R1 - R3 10K, R4 220K: $3 http://www.aliexpress.com/item/Free-Shipping-30valuesX20pcs-600pcs-1-4W-1-Metal-Film-Resistor-Samples-kit/1967996810.html
  8. MSGEQ7: $3 http://www.aliexpress.com/item/MSGEQ7-Band-Graphic-Equalizer-IC-MIXED-DIP-8-MSGEQ7-Best-selling/32467828867.html
  9. RGB + 5050 5M IP20 LED strip: $6 http://www.aliexpress.com/item/DC12V-RGB-LED-Strip-Light-SMD5050-5630-3528-3014-2835-Fita-Led-string-Ribbon-tape-Bar/32437648526.html
  10. MOSFET 50N06: $3 http://www.aliexpress.com/item/Free-shipping-10pcs-50N06-SFP50N06-FQP50N06-KIA50N06-60V-N-Channel-MOSFET-Semiconductor/642670149.html
  11. audio in splitter: $2 http://www.aliexpress.com/item/1-PCS-3-5mm-Earphone-Headphone-Splitter-Cable-Adapter-Jack-Male-to-Double-Female-Hot-Audio/32337556287.html
  12. 3.5mm male/male audio cable : $1
  13. Breadboard & cables: $5 http://www.aliexpress.com/item/free-3-3V-5V-MB-102-Breadboard-power-module-MB-102-830-points-Solderless-Prototype-Bread/1879707579.html
  14. OPTIONAL: Arduino Uno case: $2 http://www.aliexpress.com/item/Free-shipping-Transparent-Box-Case-Shell-for-Arduino-UNO-R3-not-Raspberry-pi-model-b-plus/32356111384.html

Example videos of it working: