This depends on the original copyright of the audio file. If you have the rights necessary to listen to any type of music, you can legally do so as you please.
You can legally listen to Bollywood songs online for free on YouTube or any other video hosting website they might be uploaded on. Also check free audio streaming services like Spotify and grooveshark.
One can listen to all BBC audio books online at Amazon. Amazon allows customers to listen to these audio books if they purchase them from their website.
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Legally, you can't find Harry Potter audiobooks for free. However there are loads of free podcasts to listen to!
There are many different sites online where you can find downloads for audio drivers for either Macs or Windows computers. Most of these downloads are free and take only moments.
There are quite a few places one can access Kannada Audio online. Such websites include Raaga, Galatta and MusicMazaa. One could also try the Kannada Audio Website and YouTube.
How to Broadcast All Audio from Your Computer (Windows) or Watch Internet Streaming TV in the Car
You can try an audio file sharing site like soundcloud.com or yourlisten.com. Both have user uploaded music content and are likely to have Hindi MP3's available. Failing those two, try youtube.
Use Windows Movie Maker
WMA is a windows audio file extension that stands for WINDOWS MEDIA AUDIO.
An audio spectrum analyzer is used to analyze sound waves. Basically, those lines you see when you listen to songs on windows media player constitute an audio spectrum analyzer. It breaks down sound waves and displays the spectrum visually.