53496
A cappella music was popularized between the late 2000 s and the early to mid-2010 s with media hits such as the 2009 – 2014 TV show " The Sing-Off " and the musical comedy film series " Pitch Perfect " .
 The Sing-Off, Pitch Perfect
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 The Sing-Off, Pitch Perfect