"Now Playing" Overlay pressed into video

If you have a comp with a text layer on top, and all the audio layers beneath, you can put this expression to the text layer:

for (i = 1; i < thisComp.numLayers; i++)
{
	songname = "None";
	if (thisComp.layer(index + i).audioActive)
	{
		songname = thisComp.layer(index + i).source.name.split(".")[0];
		break;
	} else
	{
		continue;
	}
}

text = "Now playing: " + songname;

No need for additional files, just make sure the song names in projekt panel (or OS) are correct.

*Martin

I think I can see what you're after.  Try this:

• Create a CSV, each song title has its own rown
• Bring this into After Effects
• Add a text layer and add a slider control to this.
• On the source text add the following expression:

song = Math.floor(effect("Song Number")("Slider"));
thisComp.layer("songs.csv").footage("songs.csv").dataValue([0,song]);

Your slider will let you set keyframes to change the text of the song, the Math.floor prevents any decimal places screwing up the code.

It is hard to give any advice without knowing any details.

How does your project look exactly?
Do you create 100 identical videos each just using a different song or do you create a single  huge video with lots of songs?

How do you insert the songs in the project?