Interview and short description:
http://www.toeich.jp/CS/pinsupo.php"Hakujaden-White Lovers-", produced by Toei Animation in 1958, was the first full-color long animation movie in Japan. 50 years later the story is revived through the musical starring Abe Natsumi.
http://www.jbook.co.jp/p/p.aspx/3188012/s lists the tracks of the soundtrack with performers. I've romanized the names as far as I could find them.
Musical "Hakujaden-White Lovers-"
1-1(4:24) 愛がある場所
Artist: Abe Natsumi
1-2(2:17) 銀鱗の聖戦士
Artist: Abe Natsumi
1-3(4:49) 聖湖の愁い
Artist: Aizawa Maki /Artist: 市川喜之助
1-4(2:53) 聖湖島の理
Musical performance: Ichikawa Ukon/Musical performance: 市川猿四郎
1-5(1:23) 秘密の砦
Artist: 澤登ひほり/Artist: 家泉明花/Artist: 澤田樹里亜
1-6(2:13) 誘いの黄昏
Artist: Abe Natsumi
1-7(2:07) 妖かしの宝珠
Artist: Abe Natsumi /Artist: Fukuda Kanon
1-8(2:44) 那妓の宣託
Artist: 仁科有理
1-9(2:43) 法界の掟
Artist: 桝川謙治
1-10(2:26) 蛇牙の挑発
Artist: 横井美帆/Artist: 平田紗知子/Artist: 中野祥子
1-11(2:25) 孤愁の鑼美亜
Artist: 彩輝なお
1-12(3:29) 白素貞絶唱
Artist: Abe Natsumi
1-13(1:51) 虹の国へ
Artist: 福田花音/Artist: 澤登ひほり/Artist: 家泉明花/Artist: 澤田樹里亜
1-14(2:05) 宿命の二人
Artist: Abe Natsumi /Artist: Aizawa Maki
1-15(6:28) 愛は人だけのものですか?
Artist: Abe Natsumi
1-16(3:17) 鑼美亜のStruggle
Artist: 彩輝なお/Artist: 中野祥子/Artist: 平田紗知子
The little kid in the pic posted buy daigong might well be HP egg Fukuda Kanon.