Problema con barra musicale

qualcuno saprebbe spiegarmi perchè si sente solo il primo
brano musicale e il secondo no??

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<a href="http://themusicninja.net/newsongs/Armin-Van-Buuren-feat.-Laura-V-Drowning-Avicii-Remix.mp3"></a>
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<a href="http://streamdrag.com/Search/bWluaW1hbA==/relevance/1/75min Minimal Techno / Tech House DJ Mix 2011 2012.mp3"></a>
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