Music is a hobby that sometimes feels more like a profession. Since I was 8 years old I've learned how to play various instruments and compose my own songs. Even though I'm no expert in the subject, I can check out for you what the future listeners of your songs will notice. If you think it through, very few people actually notice the hard-working production there is behind the music so, my service will include a review of the Lyrical Syntax, Musicalization, Rhythm, FX sounds, and Instrumental characteristics of your songs.
I do this for the pleasure of discovering new emergent artists that can be the future of music.