I keep getting calls from this number?

So this number keeps calling my phone, and I don't usually answer numbers I don't know, but this one has called me repeatedly so eventually I called the number back, but there wasn't any ringing, just music playing. I let it go a minute before I ended it because it was just music playing the whole time. Could someone explain to me what this is? Is it like a scam or something? Oh and this is on my iPhone, not a home phone.

Stalker.

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