speaking of notes that go together, i forgot to mention that when i first listened to the tracks the melodies were very simple, and i felt like there wasnt a lot of coherence between the bassline melody and lead melody, which i think is the most important part in a song. ofc nobody cba to take music theory classes to fully understand it, but i sorta got the basics of it just by listening to songs that presented a lead melody and bassline clearly and simple to the ears, and i was able to kinda study it and learn how both work together. the lead melody places the emotion, while the bass melody empowers it, from my experience. im on my phone right now so i cant give you any great examples, but i think some good examples would be some uk hardcore techno tracks because of how distint both the lead melody and bassline sound. check out the track scott brown - elysium plus and listen to the chorus. right before it, there is a piano riff. the bass only appears like a bar later though, and you can observ how it affected the melody by giving it more emotion. when i get on somthing thats not my phone ill make a not so half assed post