Melancholic Classical String Quartet Composition

I need a classical music score for a string quartet. The piece should convey a melancholic mood.

Requirements:
- Original composition for string quartet
- Classical music expertise
- Ability to evoke melancholic emotions through music

Ideal Skills and Experience:
- Proficiency in composing for string instruments
- Strong understanding of classical music theory
- Experience with melancholic musical themes
- Using Flat.io
Please provide samples of similar work.