I am new to FASTLEDs… I am using WS2812b LED strip, Teensy Audio shield and Teensy 3.6. My project is to insert SD in audio shield and play it. The LED strip has to react to the music. Can someone help me with the code. Yes!
Welcome! Sounds like a great project idea, but might be a bit advanced if you’re just getting started.
What have you tried? Most people in this community will happily help you with a specific question, but few will write your code for you. 
I recommend breaking the project down into logical steps, such as: get the LEDs working, then add audio response with a headphone jack or microphone, then get audio playing from the SD card, etc.
Search around and you should find many similar projects that you should be able to use to get started.
Good luck! Make sure to share what you come up with here!
I am succeeded with playing song form SD in audio shield using Teensy3.6 and blinking the LED. But the LED is not working as I expected it to be.
I am trying something exactly like this
Can someone guide me with the code I am expecting.
Thank You