@nixCraft For folks who use fish shell like me:

for i in (seq 100 100 1000); ffplay -f lavfi -i "sine=frequency=$i:duration=0.1" -autoexit -nodisp -loglevel quiet; end;

🎵🎶🎵🎶🎵🎶🎵🎶🎵🎶🎵🎶