Play More Than One Sound Files in Livecode

I want to create a game with sound effects. When I start the game, the background music should be played until the game is over. When I click on something in the game (such as buttons), a sound effect should be played but the background music is stopped.

How can I make the background music play continuously while the sound effect from object is playing?

I already have these scripts...

Card script...

on openCard
   play "backgroundmusic.wav" looping
end openCard

Buttons (or any object)...

on mouseup
   play "sound.wav"
end mouseup

How to play these sounds together?