I'm using Lightroom 4.4 on a pc. I'm trying to add music to a slideshow for a wedding set. It will only allow me to add one track or file. I'm using mp3 files
Only one track is a limitation with v4.4
You could upgrade to v6/cc, or-
Use a sound editor (like Audacity) to join two or more tracks together until you have one mp3 music track to last your required time.
Wow. Thanks. Guess it's back to Photoshop