If the intention is only to have one LED glowing based on surrounding sound, use a condenser micro phone amplifier connect the output to LED, If you are doing some robotic project and already audio out put is available, you can connect LED directly with a voltage divider to avoid over voltage, also you can have an Op-Amp circuit to drive the LED.The solution will be based on where are you trying to use this? how do you capture the surrounding audio? what kind of surrounding audio are you expecting?
EDITED: based on your comment,
You need a pre-amplifier to capture audio from mic, refer somthing similar to this circuit https://electronics.stackexchange.com/questions/71335/how-to-amplify-electret-microphone-to-range-from-0-5v-with-bias-of-2-5v
After this convert Audio to attractive light pattern, for that you can use db level indicator something similar to circuit in following link.
http://bestengineeringprojects.com/electronics-projects/a-versatile-decibel-meter-audio-level-indicator-spectrum-analyser/ (google for LM3914 circuits or same can be done with series of transistors and diodes, which works based on forward bias threshold voltage)
You can also combine this with rotating patterns of leds whose speed is based on audio input, if you google you will find some circuit. I can give some hint, it is possible with 555 and CD4017.