Please help me identify these Japanese songs

[SinStealer]

I need help in identifying these songs as who sang it and its respective titles as well.

1. http://www.youtube.com/watch?v=yy6t66jdHRE
A jazz funk track sung by a female. Doing a rough online translation, I'm not sure if it's Yasuko Agawa or not.

2. https://www.youtube.com/watch?v=0vGNy0aaAYQ
3. https://www.youtube.com/watch?v=jUH4MnHbJFo
Played some tapes I acquired from a thrift store then got interested by these tracks while listening to the tapes. I have no idea who sang these songs. I tried searching for the lyrics from some of the english lines of the former song but the search results left me baffled than ever.

Any information will be greatly appreciated. Thanks!

[hariharidax2]

I don't know 1 and 2 song.
But,3 is very famous song.

Song title : 裸足の季節
= (はだしのきせつ)
= hadashi no kisetsu
Released : April 1,1980
http://www.youtube.com/watch?v=eiYC0tDn_JA
singer : Seiko Matsuda
http://en.wikipedia.org/wiki/Seiko_Matsuda

[SinStealer]

Nice, thanks hariharidax2! Hadashi no kisetsu is quite a pleasure to listen that evokes a happy, refreshing beat. At the same time some of its melody has a familiar tune to it.

Two more songs to go...