#!/bin/bash
for i in /media/data1/MP3/* ; do
   while true; do 
      IN_EMPTY=('ls /media/data1/MP3 | wc -w')
      if [ ${IN_EMPTY} -eq 0 ]
      then 
         mv ${i} /media/MP3/__empty
         break
      else 
         sleep 10
      fi
   done
done