'American Idol' season 16, episode 7 recap and performances
American Idol/YouTube

Hollywood Week concluded on "American Idol" on Sunday night, with judges Katy Perry, Luke Bryan and Lionel Richie still trying to decide who deserved to move on to the Top 24. Yet the most remarkable thing about the latest episode was its numerous callbacks to past "Idol" fan favorites! Here are the highlights music fans need to see from Sunday's episode:

1) Two contestants sing Daughtry

"Idol" fans who remember Chris Daughtry's turn on the show were probably thrilled to hear Daughtry covered by two "American Idol" season 16 contestants. Both Brandon Elder and Dennis Lorenzo sung Daughtry's biggest hit "Home" for their Sunday evening performance; you can watch them both by playing the video above and see which one you prefer, and how they stack up to the original. "Home" is a song that pulls at the heartstrings, but it also has a special something that separates it from other ballads because of the grit in Chris Daughtry's voice. Neither version on Sunday quite resonated in the same way, yet it was still interesting to hear different takes on a song that "Idol" fans know well.

2) And two more sing Phillip Phillips

The history lesson continued when both Trevor Holmes and Ron Bultongez picked another song by an "Idol" veteran, with the same name no less! They each covered "Home" by previous "Idol" winner Phillip Phillips. Again, the covers were solid but whether or not they were showstopping was a matter of personal preference. It also felt like somewhat of a safe pick in a round that meant the difference between being an "Idol" season 16 finalist and coming up just short. If you want to hear the original version, you can get tickets to see Phillip Phillips live through AXS by clicking here.

3) And another Katy Perry cover

After Caitlin Lucia covered Katy Perry in front of Katy Perry during auditions, Thaddeus Johnson covered Katy Perry in front of Katy Perry during Hollywood Week. It was an ambitious song choice for a contestant with a lot of potential, especially since "Rise" is a song that requires vocal power and a lot of intent behind every word. The gamble paid off, though, as Johnson earned himself a standing ovation from the judging panel. Watch his impressive performance (and fantastic reaction to the judges' reaction) by clicking the link above.

"American Idol" airs Sundays and Mondays at 8 p.m. on ABC. Fans can get tickets to see judge Katy Perry live on her 2018 tour now through AXS by using the links below:

June 10 - Stockholm, Sweden - Ericsson Globe/Stockholm Live (Click here for tickets)
June 14 - London, England - The O2 (Click here for tickets)
June 15 - London, England - The O2 (Click here for tickets)
June 18 - Birmingham, England - Arena Birmingham (Click here for tickets)
June 19 - Sheffield, England - FlyDSA Arena (Click here for tickets)
June 21 - Liverpool, England - Echo Arena Liverpool (Click here for tickets)
June 22 - Manchester, England - Manchester Arena (Click here for tickets)
June 24 - Glasgow, Scotland - The SSE Hydro (Click here for tickets)
June 25 - Newcastle upon Tyne, Scotland - Metro Radio Arena (Click here for tickets)