CBS cut short its showing of Billy Joel’s historic 100th residency concert at New York City’s Madison Square Garden \– enraging his fans and forcing the network to schedule a rerun. Joel, 74, was performing his signature 1973 song “Piano Man” — with audience members enthusiastically singing along — when viewers in some parts of the country saw their TV screens briefly go dark before showing the late local news on Sunday night. “Hey @CBS wtf is this?! You cut off @billyjoel during Pianoman of all songs?! And then didn’t come back to it?!?! Now wonder network TV is a mess,” one fan fumed on X…