5 After Midnight did Can't Stop The Feeling in Week 1, and Saara did Let It Go then so I doubt Emily will do that.
Emily could do Still Falling For You (Ellie Goulding) from Bridget Jones's Baby - still trying to think of something even more uptempo for her, but at its original pace this would probably be OK.
Ryan could try one of the songs from A Street Cat Named Bob - went to see that last night. I think the one at the end where everyone sings along would be his best bet, good to see him get the crowd going.
Matt - All Time Love (Will Young) from Mrs Henderson Presents (suggested this for him before, more subtle than his usual fare which could be a good thing as the competition gets fiercer. however Grace Kelly by Mika (I Now Pronounce You Chuck And Larry, I think) might be more fun.
5 After Midnight - See You Again (Fast And Furious 7) Let's hear them sing properly, rather than focusing on their dancing. They aren't on Strictly this year!
Saara - From Alice Through The Looking Glass, she could either do White Rabbit (Jefferson Airplane) which was in all the ads despite not seeming to be in the film itself, or more likely Jst Like Fire by Pink. Pink would be better in that it's more moern but I couldn't resist suggesting White Rabbit too, as that's what I sang at my own audition in 2007

Honey G - Honey Honey (Abba, from Mamma Mia) Let's actually hear her sing, she'll still be in her comfort song as she'll be able to repeat her name several times!
xxxx