The MP3 and WAV are files of the music. Both of them are good and useful. I think the main difference may be that MP3 occupies less storage than WAV.
I will use the MP3 instead of WAV because it can save the storage and require more space. Nowadays people are likely to enjoy the music more often than in the past days.So,I think how the online music can be popular to people can not only be based on the less storage but on the advanced functions.
I think it shall be better to design the software of voice recognition to play the MP3 only by saying the song of the name.Just like the voice recognition software in the new IPHONE 4S which could be used to ask for the roads, add the reminds of important things, the voice recognition could be used as the same function. Furthermore, with the online service, people can order whatever they want to listen to just by talking it. The mass media and player can also provide the suitable picture for the music. After all, it's more like a home cafe with comfortable sofa and cookies.And whatever you want to do can be controlled by your voice.
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