You'll need to buy some kind of tool to cut the wire. For Music Wire, don't even try side-cutters or anything like that. I have a ton of tools, but the only tool I have that can cut music wire is a cut-off wheel in a Dremel.

For threaded rod you'll need what the man said - side-cutters or a Dremel. If you're strapped for cash, then the side-cutters are a lot less expensive.