OKAYz Ayaya~
I listen to her songs quite a bit... The songs of hers that I listen to are catchy in themselves, but Ayaya's vocals make them perfect~ I used to only really listen to her upbeat singles, like Ne~e, Momoiro no kataomoi, Yeah! Meccha Holiday and so on... I still don't listen to her ballads because I just generally don't like ballads. However, partly thanks to H!P (Egg) concerts/performances, I've now discovered some "less famous" Aya songs that I also like, such as Egao ni namida, I Know, and Zettai tokeru mondai :3 So I keep listening to those... Cool stuff.