UI Sounds - Learn sound design for user interfaces by example 🎵
Audio Hero - Over 250,000 royalty free music & sound effects for videos
Fugue - Free and premium stock music for your videos, games, and UI
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!
Chill N' Sound - Play and mix ambient sounds to boost productivity
Free Music Archive - Interactive library of high-quality, legal audio downloads