This is Mozart's Twelve Pieces for Two Horns, K.487.  I have transcribed and transposed these for F Horn and Bb Trumpet to keep them in a somewhat reasonable register.  

I had to do this to keep my horn playing wife happy - she kept complaining that I always got the top part and she had to play bottom! 

The highest note in the horn part is a high C, and the trumpet part lays mostly in the staff, with a few Gs above, and some Gs below.  Other than that they are not simplified.  I've added my own articulations and dynamics and changed a few notes to make things flow smoother. I had to do some octave transposition, since the original was written for high horn and low horn.  I am very pleased with the way they turned out, and I think you will be too. And my wife is now happy! 

They are of true advanced intermediate difficulty.  Most duets are a page long - some are two.  A total of 15 pages of music

These are also available with the trumpet part on the top part and the horn part on the bottom - search for:

Trumpet & Horn duets - Mozart 12 Horn Duets K.487

The book is printed on heavy 67 weight paper and plastic comb bound for a quality publication.  15 pages of music.  If you would prefer a staple binding, please request this.

Feel free to ask any questions - I will get back to you within a day.

I will ship within one day of receiving your order.  Additional items that you buy from me will ship for free.

Foreign shipping is based on weight, and I will keep my costs as low as possible.