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if you check the nbc website, which you did, it lists all the guests that they have had this year.
the problem with that is they sometimes run reruns. so checking the website for guests/musical acts in apriil or may will not necessarily list all the shows that they ran in those months, only the shows that were new.
if that show was a repeat, it was probably from this past season. your mystery musical guest may have actually aired in october (eminem) or january (the killers).
the only thing that i can suggest for you to get help from others here is to let us know what type of song it was. was it rap, rock, was it a female singer, male singer, white guy, etc.
there is only two shows that are listed on their website for march. the other weekends in march were probably the reruns.
odds are that the show is from sometime this year. they don't normally tend to run repeats from past years, that is for the E channel and comedy central. sometimes they run shows from past years, but those are normally when they do a "best of" or something like that.
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