Reply To: Nature Sounds ok for an aval?

Interesting. Both of those are probably Assur (if we define them as music). See the Beis Yosef in O.C. 560. Then you need to figure out if they qualify as music. If they’re just recordings of actual nature sounds it’s probably fine. If they’re computer-generated then they might be music, in which case it’s probably Assur (and probably Assur even for a non-Avel because then the Rama’s Heter goes away, though Shittas Rashi still exists).