I had a dream where I wasn't sure if I was lucid, but I'm pretty sure I was because I was aware of everything I was doing.

Basically, I remember getting a hold of an acoustic guitar in my dream. Then I began creating a tune by moving my fingers on the strings and playing them. I was constructing the song as I went along. It was very simple to play but it was incredibly catchy and beautiful. I just went with the flow and created this song. Then I told myself I needed to remember how it went so I could replicate it on a computer program in real life (since I've never played guitar), and listened to it again. When I woke up I could barely grasp how it went.

I'm 100% certain I've never heard this song before. Because as my hands went on the guitar, I was constructing this song how I wanted it to sound. But the funny thing is I don't know how to play guitar, yet it felt like second nature to me in my dream.