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It seems that everybody loves the 1, 4, and 5 patterns. (Likethe attachment) Example like C chord, F chord, G Chord.
Name any country song, and those are the chords they use.
They're the most popular chords.
Anyway about the song, you have the the base line pretty well. You now need to add some second instrumentals, possibly one thats not as fast. And if you plan on making a full song, not simply a short that repeats, you need a chorus where the song will change tempo or feel or something.
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Anyway, how do you expect to make music without an instrument?
There are lots of ways to do that. All you need is either a program, or just a microphone (for some hardcore Acapella!)