I found a way to put any number of songs in; more or less. I just copy/paste the XML "paragraph" for each extra song you want, then replace the name for each song you add to you folders (no need to rename your songs this way just put the song name "in" the paragraph). Simply delete a "paragraph" until you only have one XML paragraph for each song.
This is what each Paragraph should look like:
</SoundData>
<SoundData>
<SoundID>YOUR_SONG_NAME_HERE</SoundID>
<Filename>Sounds/Soundtrack/Medieval/YourSongNameHere</Filename>
<LoadType>STREAMED</LoadType>
<bIsCompressed>1</bIsCompressed>
<bInGeneric>1</bInGeneric>
This is what each Paragraph should look like:
</SoundData>
<SoundData>
<SoundID>YOUR_SONG_NAME_HERE</SoundID>
<Filename>Sounds/Soundtrack/Medieval/YourSongNameHere</Filename>
<LoadType>STREAMED</LoadType>
<bIsCompressed>1</bIsCompressed>
<bInGeneric>1</bInGeneric>