Process

Find all files with incorrect extensions
- find Artist ! -type d -regex "[^.]+"
  replace "Artist" with directory to search. It cannot contain or be "." due to the regex used.
Find files that are DRM protected and remove them or the protection

#!/bin/bash
if /tmp/mplayer/mplayer.exe -ao dummy -identify "$1" 2>&1 | egrep -i -q -s "encumbered with drm"
then
        echo $1;
fi

find . -name "*[$(/bin/echo -e '\201')-$(/bin/echo -e '\377')]*" | tee /tmp/filelist.log

Convert remaining all non-MP3 files to MP3 with same quality and transfer tags
- Load all tracks into MP3TAG and sort first by bitrate and then by encoding.
- Go to the bottom and select all wma with bitrate set (missing bitrate most likely means a damaged file)
- Open Xrecode
- Drag from MP3TAG to Xrecode all selected tracks
- Select mp3 output
- Select encoding rate
- (optional) Select tracks in MP3TAG by bitrate and choose encoding rate in Xrecode based on source
Use MP3Tag to normalize track numbers to 2 digits.
This will help in fixing tags using Jaikoz in a later step
Open Folder in Jaikoz
- sort by track number then subfolder
- open

Tools

Replay Gain is a technology for audio level normalization.
xrecode$$ is a tool for recoding to different formats that supports moving of tags.