17:40 The song it's Fingers by P!nk :) Going back to the other group during the performance, if I'm not mistaken the group we see at 16:38 is Secret. They disbanded in... 2016?2018? Their company was a sh*tshow, but they had good songs.
Omggg you got some good recomendations for the live performances ! And oh yeah they were reaaaally great live, very good dancers too I'm so glad you'll be dooing the showcase too, looking forward to that !
