You have surely happened to download low quality songs from the internet (from Youtube, DailyMotion, etc.). To solve this problem we resort to increasing the bitrate. The bitrate indicates the amount of digital data that can be transmitted per second. For example in the MP3 file you want to convert, there are 320 kilobits of data stored in every second of the song. Usually, the higher the bitrate, the better the audio quality and the larger the file size.
If you are downloading songs from youtube, I recommend you to use this website which is capable of converting youtube video to mp3 of very high quality (320kbps).
Once you open the site, paste the link of the video on the appropriate space and select from the drop-down menu ". mp3 (320kb)" , then click on "Convert It!" .
Once the conversion procedure is finished, click on the " Download your converted file " to download the converted file.
Audacity is a free program well known for its audio recording and editing functions. Converting MP3 to 320kbps using this application is very simple.
Download and install Audacity from this link. Once installed (without opening it) download and install this additional library (for converting to MP3).
Once installed open Audacity.
Click "File"> "Open" to load the MP3 file.
Click "File" again, and "Export".
Under "Format", select "MP3 files".
Click" Options "to set 320kbps and click" OK "to confirm.