now I use Virtuoso cause it can zoom out until have two octaves in the same time

but it can't record any tract and also have many ads.

anyone who know a good app, any idea, please share

thank you

Here are top 10 Piano Apps For iPad:
50in1 Piano HD
Pianist Pro
Etude ~ sheet music on steroids
Piano! for iPad
Twelve Tone
ezPiano for iPad: 70+ Songs with Full Accompaniment!
PlayItYourself HD
Electric Piano for iPad HD
Nota for iPad
musicalTouch

I wouldn't recommend the iPad to play piano on. ;P
You can record with Garageband. See picture below for the piano of Garageband:

I like piano sharp. It comes with some really nice classical songs. I also like music studio lite.
Depending on your budget, you can try out the free apps to demo the sounds.
These two that I mentioned I thought sounded much better than many of the free apps that I tried.
And playing piano tones on the ipad is not a substitute for playing on a real piano.
With that said there is core midi, for those who can afford to get MIDI keyboards with weighted keys.

Here's 3 wonderful apps for piano

That really depends on how you want to play it: on-screen or via MIDI, from a real keyboard (recommended). Personally, I'm getting the Alesis iO Dock, so I can use my MIDI keyboard.

I tried Magic Piano, and I still have it on the ipad. But it's a novelty item more than a good piano app.
In fact there are several apps to play piano like games. But at the end of the day, you don't really improve playing music. I recommend getting lessons instead if magic piano is something you are looking at to improve seriously.

Garageband is the best

GarageBand is the best!

GarageBand!!!