A full song doesn't always make a great ringtone for your smart phone.
A music file can be too big for a ringtone, or a song may be a bit
slow or even quiet in the beginning. If that's the case, why not select
the best part of a song and make it a ringtone for your phone? This task
can be easier than you might think.
If the latter is your choice, try Ringdroid which is one of the
