I wanted to know if there is any contradiction when someone is learning several different instruments?

For example, I am learning to play piano . Would becoming a good piano player in any way hold me back from playing another instrument professionally?

P.S. Sorry i couldn't explain well
['https://music.stackexchange.com/questions/62205', 'https://music.stackexchange.com', 'https://music.stackexchange.com/users/44336/']
It's good to keep in mind that it takes *a lot* of practice to learn an instrument. You have to dedicate a lot of time and it will take years to become a *good* piano player (same for all the instruments). So, if you want to learn how to play multiple instruments, you will have to practice all of them. If you don't have a lot of time, it will be hard to practice them at the same period of time.

This doesn't mean you cannot. A lot of people practice their skills on multiple instruments. 

> 
> Would becoming a good piano player in any way hold me back from playing another instrument professionally?
> 
> 
> 

Of course not. Quite the opposite, in fact! I started with double bass for a few years and then I started playing the piano and the fact that I already knew rhythm, melodies, harmony, theory etc, made it easier to learn the piano. If you already know an instrument, it's going to be easier to learn another one. To oversimplify it, you just have to learn the technique in the new instrument.

So my advice would be to start with the one you want to start with (I guess piano in your case) and then if you have the time, take up another one. *But*, I would also suggest that you take up the second instrument after you have learnt quite decent piano, because otherwise, it'd be quite difficult to learn from scratch two totally new instruments when you don't know anything about music.
One of the more dangerous combinations is piano and piano accordion. The similarity of the keyboard leads to a conflation of technique that results in "lowest common denominator" approaches.

The piano is a percussive string instrument featuring impetus-sensitive attack and rather fuzzy decay, the accordion is a continuous-tone wind instrument with an attack basically insensitive to key impulse and a very precise key release imprint that, through bellows inertia, also impacts the strength of the next attack, making leggiero articulation the core of fast play, and continuous bellows control the core of slow emotional play. You would not expect to change from hurdygurdy to violin without significant investment in bow technique, either...

In this case it is more the "similarity" of the controllers that is masking core differences. In a similar vein, few people are renowned for *both* piano and organ playing skills, even though harpsichord and organ is not all that uncommon as combination.

So when going for multiple instruments, it might be prudent to pick something which significantly differs in its controls. That way, you are less tempted to skip over basics that may make a difference in why people would rather hear you play a *real* instrument than a keyboard controller with sampled sounds of it.