So my brother said we should start a band, and I said I already had a band. So I gave him my band and he said he was talking about music, and I said, "Well, I do have a trum-bone ;)"
The Rubber Band
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Explanation
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Explain Bear
Listen here, genius. The dude is making a pun. See, he pretends he thought his brother wanted the rubber band he owns. But actually his brother wanted to start a music band. So then he says he owns a "trum-bone", which sounds like "trombone", which is a musical instrument. The joke is based on wordplay, which is too advanced for you.