*With the exception of Wonder Girls.
Off the top of my head:
+
Yu Chae Young - Emotion - ChaeYoung mentioned her song during an appearance of Star Golden Bell with SNSD--funny lady.
+
Baby V.O.X. - Woo Yun (Baila Baila Bonita) - SooYoung and YuRi getting their karaoke on in Sukira.
+
S.E.S - Dreams Come True - Music Bank special stage
+
FIN.K.L - NOW - Music Bank special stage
+
Lexy - 애송이 (Amateurs) - song HyoYeon sang on Song Battle.
+
Um Jung-Hwa - D.I.S.C.O. - I . . . have no idea. But I do know I've seen TaeYeon lipsynching this on ChinChin.
+
Lee Hyo Ri - U-Go-Girl - LOL @ the girls doing the dance steps. Also, Jessica sang it on Song Battle. (P.S. Plastic surgery isn't the answer.)
+
Son Dam Bi - 미쳤어 (Crazy) (ft Eric) - LOL,
TaeYeon, SooYoung, and Tiffany imitating the dance on SGB.
+
Seo In Young - Cinderella - the song Sunny imitates.
+
Big Bang - How Gee - momentarily confused hearing this during an SNSD radio appearance. Not to be mistaken for SNSD's "Gee." Hyo was totally "raising the roof" to it.
+
KARA - Honey - rival? fellow? girl group's current single.
Trot:
+
요즘남자 요즘여자 (Men these days, women these days) - I have no idea who sings this but I'm kind of shamefully in love with it. Maybe it's just because they had so much fun singing it.
+
Ju Hyun Mi - 짝사랑 - song by the trot singer SeoHyun collaborated with. Sunny sang the song on Song Battle and SeoHyun has pulled it out in recent interviews.
Dance songs I didn't know until I watched SNSD groove to them:
+
French Affair - Sexy - the song SooYoung and HyoYeon totally dork out to on Park Kyung Lim's Wonderful Outing.
+
Air - Sexy Boy - the infamous "Sexy Boy" of Girls Go to School.
+
Ida Corr Vs Fedde Le Grand - Let Me Think About It - the beat is what's playing in the
Gubne Chicken Dance Battle CF. . . . God, I love that CF, especially because it has very little to do with chicken.
And speaking of Wonder Girls,
SNSD recording their version of "Tell Me" at Music Bank some time ago.
Wonder Girls covered "Kissing You." I think seeing them cover each other's songs highlights that they are, in fact, two very different groups that are packaged and promoted differently. I really don't get all the hate that goes on between these two fan groups.
Aside: For all the debate about the performance having live vocals, I think this fancam proves that it was sung live--you can hear the track being played with the tracing elements and then stopped and then started again for a test run with Tiffany singing. The crowd's cheers that are heard in the
broadcast version are actually from
the small informal performance later (LOL, notice YuRi mess up the dance choreo), with the girls lipsynching to the earlier stage recording. The cheers are mixed into the audio for the TV broadcast. (The recent MuBank special stages of S.E.S.'s "Dreams Come True" and Fin.K.L.'s "NOW" were done in the same way: the broadcast performance recorded in front of a silent audience and the cheers recorded later in the informal performances. Confusing?) That said, I like how Jessica captured the "breathy" feel of the original "Tell Me."