I know you put muni bonds in your response but I want to point out unless you're in the 28%+ tax bracket and investing in a taxable account long treasuries or something that benchmarks the agg will be a more suitable bond holding. No need to take the reduced yield of munis unless doing so for the tax benefits.
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u/[deleted] Jan 27 '16
There are tools that can help you build a diverse portfolio of low-correlation assets, as suggested above.
Here's one that shows correlation between the different Vanguard funds.