Seriously, Look into brainwave entrainment. It will help with the "monkey brain" which is those wandering thoughts that you can't seem to shut off. The advantage is that using this, you start to understand how to meditate and shut off the monkey brain, and you don't need the crutch as much once you know how you personally reach the desired state. There are a couple of places out there that will charge you(and charge you a LOT in some cases, read "scam" you) for their cds with binaural beats, but there is also a free utility out there called "brainwave generator" which is the best utility as far as I know, and will allow you to take any piece of music or audio that you like and add the binaural beats to it. Know that there are TONS of different samples out there, but truly the best will be something like a 15 -30 minute long downward sweep from around 16 hz to no lower than 2 hz. After the downward sweep, I like to use a gradual sweep between 2 hz and 7 hz, to slowly fluctuate between delta and theta. Many of the commercially available solutions do lots of funky things like one high beta band and one low theta band - and no downward sweep. This will be ineffective as it's nearly impossible, even for someone very experienced in meditation, to drop immediately into a theta wave pattern from normal waking consciousness. I also don't see the point of trying to induce multiple entrainments, especially when the two frequencies will be forming their own binaural beats with each other. There isn't usually a way to know what type of binaural beat the makers of the commercial ones are using, but very rarely is it a simple downward sweep, which is the most effective by far.
For reference,
Beta: waking and alert. 12-30 hz
Alpha: relaxing, contemplative, light meditation. 8-12 hz
Theta: Deep meditation, light sleep. 4-8 hz
Delta: extremely deep meditation, deepest form of sleep. 0-4 hz
I know this post is becoming convoluted and not very congruent, and I apologize.
Personal taste is important, but I'd still recommend using something like Enya over Slayer. A happy medium can be achieved. Music without lyrics is better than music with, as the lyrics can make you start thinking again.
As for me, I've got ADHD as well as an extremely multitasking oriented mind, which can make quieting the monkey brain quite difficult. What I found to work best when first learning meditation was a modified form of using a Mantra. A mantra is a word or concept that you repeat, or sorta draw out into a constant, within your mind, as a focal point instead of thinking about the random wanderings of your mind. I found my mind was capable of keeping my mantra (I used the traditional "OM", pronounced ohm, because it's a very easy sound to draw out into a constant)while simultaneously thinking about other things. I then simply replaced that train of thought with another instance of "om", and did that each time a new train of thought came up. This eventually led into me focusing on four separate instances of the mantra, in the four distinct hemispheres of my brain. I do realize this isn't actually how the brain is functioning, but the visualization was effective.