If you'd like to experience more synchronicity in your life, I have a suggestion.  First, you must be open to the concept.  Anyone can experience the world spiritually or non-spiritually...it all depends upon your thoughts and beliefs.  In my experience, music is a common way in which synchronicity speaks to me, and has often been a source of great insight (and amusement).

Try listening to your favorite songs on an mp3 player (or any other kind of music player) that is set to "shuffle" or "random."  I suggest making your library of music as large as possible, as this gives a greater "vocabulary" to the universe.  If you only have a hundred songs, you will experience synchronicity, but if you have a thousand songs, you will hear more customized messages.  If you are indeed open and receptive to the concept of synchronicity, you will soon be able to notice how the music that is playing will often correspond with what your are doing, thinking, or feeling.

You may have already noticed music synchronicity while listening to the radio.  However, there are many advertisements (which, like everything else, can be sources of synchronicity but are often annoying) and you will not be able to customize the music to your values and beliefs the way you can with your own randomized collection.  Nevertheless, any form of randomization can be a channel through which synchronistic messages are delivered.

I would like to strongly recommend that you edit out songs that don't reflect your values or self-concept.  I believe that the information we take in is a conscious (or subconscious if we're not paying attention) form of programming ourselves, so if we take in songs about death, helplessness, guilt, etc. then we are programming ourselves to reflect these attitudes, and manifest these experiences in our lives.  Of course, if there is a song that you really love, you'll probably want to keep it in your collection regardless of its lyrics.

Additionally, remember that you determine who you are.  Synchronicity may reflect who you are, and it may challenge your ego by presenting options, but you always have free will and are always creating who you want to be.  Just because you are emailing someone you are attracted to and you hear a "love song" come on doesn't mean that you are destined to be lovers.  Synchronistic signs can not tell you who you "should" be.  It is always up to you to decide what you value, and who you truly are.