If you'd like to notice synchronicity into your life, I have a suggestion.  This will cost some money, but if you can afford it, it may be worth it for the endless hours of mind-expansion, amazement and guidance (if you are receptive to it).

Try to find a reasonably priced 25 to 300 disc cd player (depending on the size of your collection).   It should be one that allows you to edit out or "delete" songs you don't want to hear.  I have a Sony model that allows this but you may want to check around to see if others have this capability.

After acquiring a cd player, place all of your cds in it and put it on "shuffle" or "random."  If you are open and receptive to the concept of synchronicity, you will eventually 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 a multiple-disc cd player.

Synchronicity of course works with 3 disc and 5 disc cd players, but to give the "voice of synchronicity" a larger "vocabulary" it is helpful to find a player that is capable of holding your entire collection of cds.

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.

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" doesn't mean that you are destined to be lovers.  Synchronous signs can not tell you who you "should" be.  It is always up to you to decide what you value.