Which songs do you think...

[zyoeru]

I'm going to be weird and add these too:

Momen no Handkerchief - Hiromi Ohta
Ii Hi Tabidachi, Nishi e - Momoe Yamaguchi
Amagigoe - Sayuri Ishikawa (performs it all the time on Kouhaku)
Nada Sou Sou - Rimi Natsukawa (Ryoko Nakamori originally sang this but it was made famous by Rimi Natsukawa and has been covered COUNTLESS times)
Shima Uta - THE BOOM
jupiter - Ayaka Hirahara
Sotsugyou Shashin - Yumi Matsutoya (Under her birth name Yumi Arai)
Ai Uta - GReeeeN
Kiseki - GReeeeN