'The Voice' season 14, episode 23 recap and performances
NBC/YouTube

"The Voice" season 14 semifinals got underway on Monday, with the final eight artists in the NBC singing competition performing for only three guaranteed spots in next week's finale. With the field having narrowed but two hours of time still to fill, Monday's episode also introduced duets in which two contestants performed a mashup of two hits from the same artist. That's a lot to go through, so here are the highlights music fans need to know from Monday's episode:

1) Semifinal solo performances

The first performances on Monday were the usual solo efforts, with a set list of mostly classic rock. Team Blake's Pryor Baird had another great night with his cover of "Change The World," which you can watch by playing the video above; it demonstrated how less is more (and also proved how the song has held up well decades after its release). His teammate Kyla Jade went for an even more well-known tune with "Let It Be" but we've heard that song numerous times on "The Voice," and it wasn't nearly as good as when Adam Levine and Tessanne Chin performed it as a duet in "The Voice" season 5.

2) Mashup duets

The idea of mashup duets made "The Voice" feel like a non-a cappella version of NBC's late "The Sing-Off." The best collaboration of the night went to Adam's artist Rayshun LaMarr and Alicia Keys' contestant Jackie Foster, whose combination of the Imagine Dragons hits "Radioactive" and "Believer" turned the stage into a rock concert that Dan Reynolds would've been proud of. They were clearly having a great time, going for it with plenty of gusto - and plenty of fog from the show's fog machine. Watch it by clicking the link above.

Related: 'The Voice' renewed for season 15 with new coach lineup

3) The early iTunes edge

After this episode was broadcast on Monday night, songs from "The Voice" semifinalists immediately began climbing the iTunes Singles Chart. After another season of starting slowly, the show's single releases have once again picked up as the season gets closer to its end. The Monday night chart results are good for Kelly Clarkson, as both of her remaining artists have reached the Top 10 and therefore should receive the all-important iTunes bonus that multiplies their iTunes downloads by 10. Blake Shelton has two of his three artists on the chart as well, so we could be looking at a Blake vs. Kelly finale. Music fans can tune in Tuesday at 8 p.m. to see the finalists revealed.

"The Voice" airs Mondays and Tuesdays at 8 p.m. on NBC. "Voice" fans can get tickets to see Adam Levine and Maroon 5 live through AXS by using the links below:

Sept. 9 - Denver, CO - Pepsi Center (Click here for tickets)
Sept. 11 - Kansas City, MO - Sprint Center (Click here for tickets)