Not need to worry at all if you have not kept the backup of your audio files from your Android LG phone.
With the help of Android data recovery tool, you can easily restore your deleted audio files from Android LG Phones, until and unless you have not overwritten the data on your LG phone with any new data.
To recover audio files from LG phone, you can ask help from LG data recovery software. A short time scanning later, the audio files on LG phone will be scanned out and recovered to pc. You just need to connect LG phone to pc, start the software.