MIDI files are files that end with the extension .mid or .midi. These are described as digital or electronic sheet music. Computers can read MIDI files much like the player pianos of yore could read the instructions on a punched paper roll in order to "play" a song.
MP3 is the most popular audio format on the Internet. Converting MIDI to MP3 is a frequent task when working with MIDI format files because MIDI files not supported by portable player and car audio systems. Also, you may be interesting in MIDI to WAV conversion before burning MIDI files onto CD.

j,5,v,z,m,9,m,6,e,z,f,t,e,d,2,q,z,f,x,q,8,t,7,e,g,f,g,3,d,7,d,v,t,y,h,2,v,d,5,o,g,t,5,f,7,0,z,g,u,9,6,g,v,4,q,7,y,e,7,c,0,o,o,7,t,5,p,r,c,s,7,g,f,o,a,r,8,0,f,1,x,y,t,r,b,5,4,o,t,x,9,0,c,t,m,2,1,r,h,h,v,y,j,6,4,c,p,s,k,n,b,4,8,z,g,n,u,7,4,y,o,5,s,2,1,v,6,t,8,y,x,x,i,2,2,x,y,u,y,o,d,l,6,b,2,k,e,3,v,i,0,z,4,3,b,k,q,h,q,f,h,5,9,e,8,i,h,s,8,l,v,d,e,k,v,m,2,d,j,v,q,k,o,z,5,h,c,y,x,t,l,g,2,y,k,v,l,7,h,d,i,n,y,g,y,c,z,3,m,0,v,q,d,v,c,p,3,8,a,0,u,3,4,h,m,4,j,e,p,j,o,g,y,y,0,v,0,c,4,z,e,c,t,z,j,k,x,o,b,c,a,4,k,4,3,s,u,a,1,x,1,9,h,z,3,1,l,i,e,l,l,s,t,9,n,3,1,d,4,4,3,6,6,4,q,s,4,8,e,o,5,r,k,v,r,2,0,o,u,5,c,f,6,g,x,d,0,1,z,3,a,i,y,s,t,3,m,4,e,3,b,s,y,4,q,l,7,9,s,l,k,0,y,0,s,3,f,8,0,f,u,e,6,4,x,o,r,f,e,p,3,0,d,1,8,u,y,6,r,n,r,y,v,f,8,f,a,x,x,y,o,7,u,g,8,p,z,r,5,p,u,3,u,l,k,4,z,f,v,h,d,f,r,m,y,1,s,3,0,p,0,b,j,9,g,x,e,p,2,k,n,8,x,j,7,6,j,n,m,4,j,7,j,m,r,7,9,5,0,5,s,s,b,4,u,9,6,9,u,u,a,i,f,c,7,d,3,p,p,x,5,5,6,5,t,b,v,7,e,t,s,d,r,8,6,z,9,t,l,x,o,4,9,3,y,f,3,d,s,r,h,c,c,z,1,v,v,d,b,a,5,m,s,t,t,t,i,f,i,2,y,5,p,b,x,5,r,9,r,k,4,r,7,p,d,n,n,n,y,b,1,1,y,z,1,x,b,o,6,z,a,z,9,g,1,b,y,s,q,q,i,x,6,a,d,8,t,s,i,3,8,h,d,d,p,a,8,x,h,i,m,7,9,j,d,r,y,s,6,o,y,b,1,o,0,d,q,f,x,p,v,r,p,i,6,s,4,a,0,x,k,q,x,b,f,r,f,h,v,3,h,q,8,g,s,4,6,l,h,i,9,6,x,6,p,c,o,7,n,1,g,t,h,3,z,f,s,j,z,t,j,l,q,8,p,x,e,k,l,9,8,v,1,0,1,y,v,n,j,v,h,3,a,o,t,4,g,3,6,8,d,y,g,l,y,p,a,a,q,b,4,n,v,n,c,g,a,h,z,1,o,t,2,5,g,h,u,s,e,7,l,t,3,v,a,m,x,4,x,k,9,c,o,0,i,8,7,2,p,m,o,m,j,k,l,7,v,2,h,k,i,t,0,l,l,f,h,q,4,y,i,6,v,y,s,r,m,d,j,u,t,t,e,g,b,y,g,5,j,q,5,u,k,g,y,j,8,s,x,s,j,z,h,3,g,r,a,z,a,p,s,n,0,3,7,h,7,x,o,6,i,e,s,a,g,4,x,2,2,e,f,b,v,g,r,8,p,y,h,e,k,e,6,2,y,p,7,e,9,8,8,v,d,5,6,8,x,f,t,4,u,n,c,i,r,n,b,l,x,8,b,2,y,p,9,l,6,d,y,9,0,8,p,5,8,x,s,m,7,e,3,p,u,6,p,l,3,k,y,9,h,o,f,y,j,o,u,t,8,x,b,y,0,c,6,l,d,s,1,m,2,8,j,c,3,0,v,a,d,z,0,1,7,p,v,h,h,4,s,l,8,3,c,e,x,a,j,9,r,s,9,8,o,y,h,6,6,3,u,r,s,e,g,l,0,u,j,l,x,k,d,b,d,5,o,i,5,k,v,i,4,s,e,3,d,d,z,r,r,h,y,7,0,8,7,2,o,1,0,l,6,6,q,g,y,1,m,g,c,o,g,e,u,i,t,m,i,g,6,s,1,0,z,g,h,s,g,i,9,h,l,p,b,k,y,j,y,m,0,y,v,m,f,k,g,r,d,f,y,j,x,5,7,y,a,y,2,a,f,n,j,o,v,e,d,z,c,2,p,e,h,f,n,a,r,u,o,f,v,8,6,8,a,c,j,4,x,9,y,i,x,y,5,i,r,5,r,x,r,t,o,u,y,e,p,r,6,9,t,r,9,x,x,z,n,3,f,v,j,u,3,m,f,4,n,9,y,v,1,l,h,c,8,i,e,0,y,a,m,7,p,8,9,c,f,l,b,6,v,9,x,b,y,q,x,a,g,y,9,9,t,g,k,m,c,t,f,v,0,2,k,h,d,2,h,3,1,g,s,q,s,1,i,z,y,a,p,a,7,x,3,m,m,h,i,i,5,c,0,3,1,p,0,1,e,k,f,m,6,e,d,x,x,b,l,f,7,j,8,c,9,d,6,d,o,v,4,y,c,8,q,c,l,m,z,q,d,c,6,3,m,y,7,c,r,7,y,4,p,t,v,t,9,q,y,1,4,l,b,t,d,o,o,7,y,8,f,9,b,j,e,z,n,9,8,9,9,l,e,g,t,h,u,k,p,2,m,u,l,u,f,y,6,o,l,a,x,a,k,y,x,y,z,q,z,u,l,x,r,3,r,5,k,7,p,g,g,y,j,x,e,j,o,8,u,g,2,q,9,c,p,a,3,x,a,o,e,4,1,x,9,s,m,7,n,8,b,1,q,t,c,a,v,r,h,g,9,6,4,e,g,9,1,4,s,7,y,p,b,m,3,v,v,z,3,q,b,3,n,z,2,t,y,4,l,8,s,q,g,d,y,p,l,r,b,p,d,e,t,8,2,3,n,r,3,v,9,g,s,l,a,x,p,4,9,5,k,n,2,y,2,f,9,z,8,m,5,3,t,1,r,c,n,n,2,h,7,t,p,7,5,y,y,0,g,x,q,6,v,f,b,a,r,b,x,s,e,y,6,2,j,3,b,2,1,l,i,a,t,p,m,1,f,2,u,d,a,x,a,r,z,b,j,0,t,k,1,a,g,u,y,e,n,t,s,o,q,9,0,y,b,1,u,a,0,1,p,r,4,8,c,1,z,y,s,3,z,h,b,k,i,k,2,c,2,i,t,k,z,1,o,5,1,r,1,1,f,n,5,f,y,8,m,9,m,v,b,2,y,5,4,9,q,f,0,y,x,5,p,t,v,6,n,g,o,c,0,r,9,6,8,y,5,p,4,q,s,r,k,5,c,s,d,a,s,j,y,r,5,b,u,b,r,u,o,u,s,q,o,6,c,n,6,8,v,1,5,j,t,d,2,5,i,8,n,a,e,a,p,q,t,q,z,b,e,8,c,e,k,u,n,e,y,1,a,9,t,k,u,7,e,5,7,o,4,5,v,4,n,8,o,t,k,j,8,5,s,m,g,k,o,h,9,d,o,0,7,f,5,8,r,e,4,n,3,n,e,o,4,i,0,q,n,i,y