The Little Negro [Flute or Clarinet and Piano]
- Editor's Choice
I am recommending this for two very simple reasons. Firstly it is in C major, short and relatively straightforward. It does however venture up to top C which is printed properly for students to read and is therefore very good practice. Secondly it's cheap!
Difficulty level, roughly compared to ABRSM exam grades. 0 is beginner, 9 is advanced (beyond grade 8).