|>>|| No. 11312
You can acquire a broader musical palate without being a trained musician. Just listening attentively will allow you to develop an intuitive understanding of the grammar and vocabulary of a particular style of music. That understanding is often transferable between genres. Broadly speaking, pop music was much more sophisticated back in the 50s and 60s, in large part because most of the listeners would have been familiar with classical music and/or swing. It's a lot easier to enjoy Mongolian traditional music if you're already familiar with minimalist western composers like Philip Glass or Brian Eno; it's easier to enjoy jungle if you're familiar with garage or house.
In recent decades, most people have been exposed to an increasingly narrow range of music. Sixty years ago, most households had one radio and one record player, so music was to an extent a communal and intergenerational experience. The transistor radio and the dansette allowed teenagers to listen to their own music in their own bedroom, shutting them off from the boring music their parents listened to. The walkman arrived, then the MP3 player, then (not coincidentally) Top of the Pops went off the air. Technology gave us the ability to listen to exactly what we want, which is a double-edged sword; if you never listen to music you don't like, your tastes will never broaden.
To return to my "fast food music" analogy, it's never a good thing if we get too much of what we like. Without a lot of pushing and prodding, most kids would rather subsist on a diet of chicken nuggets and chips. It takes considerable time and effort for them to be introduced to a wider and more challenging range of foods and learn to like them. Nobody is born with a taste for broccoli or olives or chili peppers. If you don't have an older brother or a music teacher with a great record collection to broaden your horizons, you're unlikely to push through the shock of the new and develop a well-rounded musical diet of your own volition.