HOW TO CUT MP3 AND MERGE FILES IN LINUX UBUNTU

First do the download the audacity
sudo apt-get install audacity

After open the program and add your music select for delete  stretch that you want and export the file for .mp3.

for know how is possible cut the files you can see this kb:
source1: https://manual.audacityteam.org/man/tutorial_editing_an_existing_file.html
source2: https://www.wikihow.com/Remove-Unnecessary-Audio-with-Audacity

after  that, execute that for all files thtat you want start the merge executing this procedure in terminal.



ffmpeg -i "concat:1.mp3|2.mp3|3.mp3|4.mp3|55.mp3" -acodec copy output.mp3

and walla... done my friend. just play your new music.