The piece technology that like me is MP3, it piece has been replace for the mobile phone, you have all in one, but the Mp3 is more simple and you have not that worry for the calls or baterry, and memory, you only have to put your headphones on, and enjoy the music. The Mp3 was an apparatus that in other time replace el wallman, an piece that used cd, during the 90. This was fantastic too, when arribe the digital age is was forgetting. But, the Cd always will be in my heart. 

Now, the Cd and casette always will be important for the people had, for me also are nice memories, but the Mp3 is more practical :D but for me a negative aspect  is the way as download music, for me is complicated, but I have friends that share music. 

Also, in the Mp3 you can put memory, and is more cheap. In aspect negative the it are that your digital format is intangible, and is difficult in case of lost or hurt is total. In this moment I have no Mp3, the last mp3 that I has was a many years ago, I want to buy one, please that is not so expensive!!!!!!!