These concepts all apply to real guitars and other instruments as well.
Rubber band guitar strings.
If your rubber bands are long enough you can stretch them all the way up the neck.
By carefully manipulating these variables for example using rubber bands that are all the same length but different thickness you can create a rubber band guitar with multiple strings that each have a different pitch.
The paper towel roll will become the neck of the guitar which you can tape or hot glue to the tissue box.
You now have a working guitar model.
All about building cool string instruments with rubber bands.
The sound made by your instrument was the sound created by the rubber band vibrating when you plucked it much like how a real guitar string vibrates when played by a musician.
Pick the one that makes the best melody and play it.
Every one of them will sound different.
Use six strings and tune them exactly like a guitar.
For one it does not require very high end products to make and it can be easily brought through with simple things that are usually found around the house.
Making a guitar using rubber bands is a fairly simple exercise that is definitely not rocket science.