muni and corporate bonds?

There is absolutely no conceivable reason to have munis in a Roth.

ETA: and low interest rates mean that bonds are more expensive, so no to that as well.

Bonds rates are low, yes, but rates work inversely with value. If the rates start picking up again, bond values drop.

As others have noted, having a muni in a Roth seems not very smart since Roth gains are tax-free anyway. That said, if you wanted to invest in a muni bond issue that people think is risky a Roth might be the place to do it. Detroit general obligation bonds, for example. If Detroit's bankruptcy works out the bonds could jump hugely. Or you could lose everything. That kind of volatile security is what you want in a Roth.

quote:

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if you are looking for safety and want to get more yield than cash I could see putting some money in short term high quality munis in an IRA.

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That's still not a good reason. The interest on a muni is tax-free to start with, it doesn't matter what the rate is.

As I pointed out, there can be one reason, namely if it is a high-risk muni like Detroit's - because if you get lucky and have large capital gains that is not tax-free unless it's in the Roth.

You don't want your safe stuff in the Roth, you want the risky stuff there.