Depending on the software in use and the amount of editing/filtering going on the Celeron might not have the CPU oomph. Plus audio tends to be very IO heavy, and I wouldn't trust the 32GB of flash storage in that NUC to last more than one recording session at best (I used to have my DAW running on an older SSD and after about 2 editing sessions the whole thing ground to a halt from hitting write amplification).
So, Phage, any chance of getting some more details? Like what interface he plans to use, what software he'll be using, and what kind of music production? Live recording? Mulit-tracking? Electronic music (i.e. masses of samples, no real instruments
)? They all have different requirements...