In a video obtained from the Friday concert, West, at one point, was forced to cut the music, reported TMZ.
"There's no piano. Stop the track," he said while onstage. The rapper reportedly addressed the situation by saying, "This is the best dress rehearsal I've ever had."
The glitch occurred apparently as a result of his lack of preparation. The 38-year-old "Heartless" hitmaker was allegedly late to the rehearsal the night before.