Its called Suzuki method, very popular for violin, not so much for piano which is usually sightreading from day 1.
I was raised on "sightreading from day 1" on the cello. Fortunately I picked up playing by ear on my own, so it was never an issue. I think that instruction has improved since I was a kid.
Hi
This is the first time I hear about the Suzuki method.
My grandpa was a violin teacher. He taught my dad to play by ear, when he was 4 years old.
Pa told me, he was not allowed to read notes, until he started playing the piano (two years later).
Funny thing: I could read notes before I picked up the bass...
I was always sitting on my dad' s lap, when he played the piano and I was a curious kid!
When I started playing the bass, I bought a "method" with TABs and a whole bunch of songbooks
(Beatles, Stones, Led Zep,...)
My dad saw them, burned them



and bought me a tape recorder!
I had to promise him to learn by ear, playing along to my records!
Suzuki? Never heard of!
Back to OP: Free your keyboarders! Burn the charts!

Cheat sheets are cool, when you have to cope with hundreds of songs,
that change frequently.
But the standards, you have to know by heart!
And you should be able to play them in all keys! (IMO)
may the bass be with you
Wise(b)ass