Bose speaker and iPhone 4s

I have a Bose speaker (expensive) that I got when I had an iPod Photo. The iPod is long gone, and I'd like to use it with my iPhone 4s I know it won't charge, but I should be able to pump out sound.



It plays for maybe a minute and then quits.



Any ideas why?



I tried YouTube music, purchased music, etc and no joy.





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