What are the elements of a truly striking instrumental guitar song?
I think you have to go back and examine the music of the ’50s and ’60s, where bands like the Ventures had a discernable sound and catchy melodies. Simple is usually better. An instrumental piece doesn’t have to deliever a barrage of notes and changes to be interesting. It also helps to remember that many listeners probably aren’t used to hearing guitar instrumentals, so you have to imagine the guitar as the vocalist, and the tone and the melody must be seductive.