Billie Ellish, Harry Styles, Sam Smith, Doja Cat, Dua Lipa, Shawn Mendes and The Weeknd turn in socially distanced sets in the “iHeart Radio Jingle Ball 2020” (CW, 8 p.m.). BTS, Lil Nas X and Mariah Carey also make appearances.
More traditional music is found in this year’s “Christmas with the Tabernacle Choir” (PBS, 9 p.m., check local listings), who are joined by Kelli O’Hara and Richard Thomas.
They’re singing to win on the first half of the season finale of “The Voice” (NBC, 8 p.m.). Viewers can vote from among Cmi Clune, Ian Flanagan, Tamara Jade, Bailey Rae and Ben Allen. The winner is named Tuesday.
A new series “Tiny Pretty Things” (Netflix, streaming) follows the world of an elite ballet academy, based on the book by Sona Charaipotra and Dhonielle Clayton and starring Lauren Holly, Kylie Jefferson, Cashmere Jollette and Daniela Norman. Set in Chicago, the 10-episod first season was actually shot in Toronto.
“Celebrity IOU” (HGTV, 9 p.m.) begins a second season with Zooey Deschanel joining Jew and Jonathan Scott in surprise renovating. The former “New Girl” is dating Jonathan.
“20/20” (ABC, 10 p.m.) takes a look at the development of the vaccine.