Most music is built around diatonic scales, which means a seven-note scale. Why are there 12 keys? It’s quite simple – it’s because there are 12 notes in music. In music, there are basically 12 key signatures, as represented by the circle of fifths. While this is not a post about music theory, I’ll cover the basics, so you aren’t lost without any help. Many of them are perfect for chill, mellow, lo-fi music projects. I’m hearing some ambient chords, somber fingerpicking, heavily effected rhythmic wobbles, and much more. You can listen to all of them on the LANDR website, and you can either download them one by one or in one convenient package. Just as the name would suggest, there are 50 samples included, in a variety of keys and BPMs. LANDR is mostly known for their A.I.-powered mastering services, but they do have side projects like this one – 50 Best Free Guitar Samples.