How do u make mp3 smaller in size?

go to www.dbpoweramp.com and download their free music converter which will let you convert between music formats and, more importantly, convert an mp3 to a lower bitrate

i use it all the time to convert huge mp3s at bitrates like 300 down to 128 or 96 - halving the bitrate will halve the size of the file

Although this helps you not at all I don't believe you will find a file format smaller then MP3, most other audio formats use larger amounts of memory; Perhaps lower the quality? Then again I wouldn't be able to tell you how.

Reduce the bitrate.

reduce the bitrate

then it will work