Don't be afraid to pitch the WAV files up or down several semitones to change the mood or fit your track's key.
Every melody loop comes with its own individual stems (track-outs) and MIDI files , allowing you to swap sounds or rearrange the patterns. Cymatics Utopia Free Melody Loops [WAV]
Though it is free, you typically "purchase" it for $0.00 to receive the download link and a personal license agreement via email. Don't be afraid to pitch the WAV files
The samples are 100% royalty-free, meaning you can use them in your commercial projects without owing future payments. Cymatics Utopia Free Melody Loops [WAV]