I am trying to get aplay to play an wav at 44100 Hz.
aplay -c 1 -t wav -r 44100 -f Relax_6_Seconds.wav aplay: main:604: wrong extended format 'Relax_6_Seconds.wav'
The problem was in using vlc to convert the mp3 to wav.
When I used mpg321 to convert it, it played fine.