How I Met Your Mother Season 9 Spoilers: Boys II Men To Cover Song!

How I Met Your Mother Season 9 Spoilers: Boys II Men To Cover Song!

A new spoiler tweet by Craig Thomas has revealed that Boys II Men is set to cover a song for How I Met Your Mother season 9.

Craig Thomas tweeted "So @BoyzIIMen stopped by to cover a #HIMYM classic today and it was awesome - stay tuned to find out which one!" along with the picture below:

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Source: Craig Thomas

What HIMYM classic song will they cover?