If you desire to understand and appreciate it then you need to cultivate a taste for classical. This can only be done by listening to a broad range of classical regularly. We are fortunate to be living in an age when CDs are available everywhere. However sometimes the prices of these CDs are quite high and it discourages people from buying them. But a collection of CDs is definitely a treasured possession for a true music lover.
Light music can be easily sung or played by anyone that's why people forget about the richness of classical. But once you have developed a taste for it you would have much more pleasurable experiences than you can have while listening to popular music. It explores greater depths of emotions in a much more refined manner that is why its effects last much longer than popular.