Music For Makers - Licensing good music has never been this easy.
SCARM - Simple Computer Aided Railway Modeller
TunePocket - Download 11,000+ royalty free music tracks and sound FX. Buy once, use forever. New music added daily. Save over 50% compared to most popular similar services. Incredible value!
RailModeller - RailModeller is a new application for creating model railroad and slot car layouts.
Incompetech - Royalty Free and Creative Commons Music Archive
AnyRail - AnyRail makes model railroad design so easy, it's fun!