LED dimmable lights in audio room?

Every dimmer switch and every led bulb is different. If you find the quietest set you can help them by adding ferrite chokes to the wiring at the lights.
I have them in my basement. No noticable degradation to the surround sound system there. If you can’t find a quiet dimmer just replace with a SPST.
A Trifield EM100 will help finding the noise.

The best lighting is of course the lava lamp.

I use Philips Hue lights through Wifi in my room and haven't had any problems---they were super easy to install and give off very cool effects. 

I've used leds with both dimmers and sound activation. None of the buzzing, humming I get with dimmers and incandescent bulbs. There will be rfi emanating from transformer/power supply, move it away from sensitive audio equipment. I often take measurements with my Trifield meter, certainly many pockets of rfi, some comes from audio components. I see quite a bit from linear power supplies. As Carbonmiller stated, you'll never be rid of rfi.

The problem with dimmer switches is that they control the level using pulse wave modulation (PWM). The circuit is rapidly switched on and off to modulate the amount of power passing through. This generates a lot of radio frequency noise.

Lutron (a manufacturer of dimmer switches) has this note about using a filter to reduce RFI noise: https://www.lutron.com/TechnicalDocumentLibrary/360484.pdf