Translation of irreplaceable in Spanish

Probably we will make additions to our dictionary. I'll be available in January and in February, but not in March, because I'll be in the United States for about three months. About a week in New York, a week in Chicago and Detroit.
I'm quite tired too by now. So, if it doesn't work just drop me an email and I'll see it first thing in the morning. I wanted to add new words to the dictionary however the other issues kept me more busy than I have imagined.
My name is Julio and I live in Santiago, which is in Chile. I speak a little German, but I want to improve. Where are you from? Where do you live? What is your favorite music? Auf wiedersehen!