To handle the different browser save the music track in 3 different formats.

Use http://audacity.sourceforge.net to convert audio to ogg, mp3 and aac.

<!DOCTYPE html> <html> <head> <style> </style> </head> <body> <audio controls autoplay loop> <source src="/teach/jazz.aac" type="audio/aac" /> <source src="/teach/jazz.ogg" type="audio/ogg" /> <source src="/teach/jazz.mp3" type="audio/mpeg" /> </audio> </body> </html>