Here is a '90s kid's song from Hirake! Ponkikki (ひらけ!ポンキッキ: a kid's show that was on Fuji TV). The title is Hello, My Friends (ハロー・マイフレンズ).
It's a good song if you're learning Japanese or an instrument because it's simple.
Below are the lyrics/translation and the chords (I worked the chords out by ear, so are not exactly correct but sounds fine). The song is in the key of F.
F C7 C7 F
あおいそらに ぽっかりしろいくも
Aoi sora ni pokkari shiroi kumo
Blue sky and fluffy clouds
F Bb C7 F
それだけでほら ステキなきぶん
Soredakede hora suteki na kibun
That's enough to feel fine
F C7 C7 F
はなはさいて かぜはやさしいね
Hana wa saite kaze wa yasashii ne
Flowers are blooming, the wind is gentle
F Bb C7 F
ちきゅうはボクらのたからじま
Chikyuu wa bokura no takarajima
The Earth is our treasure island
(Chorus)
F Bb
ハロー マイフレンズ
Hello, my friends
C7 F
ハロー マイワールド
Hello, my world
F Bb Dm C7
きょうはしらない キミとボクも
Kyou wa shiranai kimi to boku mo
I might not know you today
F Bb
ハロー マイフレンズ
Hello, my friends
C7 F
ハロー マイワールド
Hello, my world
F Bb C7 F
あしたはきっとともだちさ
Ashita wa kitto tomodachi sa
But I'm sure we will be friends tomorrow
F C7 C7 F
うみのむこう ことばはちがっても
Umi no mukou kotoba wa chigattemo
On the other side of the ocean, we might speak different languages, but
F Bb C7 F
おんなじじかんを すごしているよ
Onnaji jikan o sugoshite iruyo
We are all living in the same time
F C7 C7 F
ひとりぼっちじゃ そうさ かなしいね
Hitoribocchi ja sousa kanashii ne
Being alone, indeed is sad
F Bb C7 F
こころはかみさまのおくりもの
Kokoro wa kamisama no okurimono
The heart is a gift from God
