I love music. I love playing music, listening to music, going to shows. It's the best. One of the best experiences in my life (pre-mission) was playing concerts. When you've got other awesome bands playing with you, a good sized crowd full of pumped people, and everyone's just going nuts to the songs that you wrote and are playing... Few things can beat that! Music is such an amazing thing. Few people, if any, dislike music. Everyone can find something they like. It can be anything heard on the radio, or old stuff that isn't made anymore, or different stuff that few people have even heard of. It speaks to everyone on the most personal of levels, can lift people up, and can be used for the perfect expression of your feelings. But, despite all the vast amounts of different music styles out there, music as a whole can speak to anyone and everyone. Not everyone can make music. Some people I know are obsessed with music, and yet don't play an instrument. You don't have to be part of it to love it, just have an appreciation for the skill required and the sounds produced.
The Gospel is very similar to music. Though there are differences in all people, and they each require different things, the Gospel can speak to them specifically and help them with whatever they may need. Also, different specific aspects will apply to various people. Someone may really latch onto the Plan of Salvation, and others may be truly touched by the story of Joseph Smith. But, regardless of the specific circumstances, the Gospel as a whole can reach anyone and everyone. It's so multi-layered that at any time, despite your struggles or issues, you can find something there that will encourage, strengthen, and enlighten you. Plus, just like with music, you don't have to be an expert to benefit from it. You don't have to know the Bible and Book of Mormon inside-out and backwards. You don't have to be a scholar or doctrinal genius. Even the simplest of people with just a very basic understanding of the doctrine can feel the Spirit and be edified. All we need to do is live righteously, follow the commandments, and stay strong and faithful, and anyone can be blessed from the wonderful gift of the Gospel of Jesus Christ. Just like music has the power to break through any and all barriers, so does the Gospel.