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I'm not entirely conviced that I can conceptualize music blogs the way you do--my brain wants to resist systematics and engineering (my thought process is much more likely to devolve into a bunch of asides and caveats and unending streams of parentheses, which makes it difficult for me to come up with "systems")--but for the challenge, and because I think the underlying question (How can we better influence the music tastes of our readers?) is an interesting one, I'll make a go at it.
music blog vs. mp3 blog:
I think we should be past the concept of "mp3 blogging". The number of music blogs that restrict themselves to mp3s can probably be counted on one hand. Music blogging increasingly involves using other media--streaming video/audio in particular.
If we've proven that a music blog can achieve and sustain 300-3000+ hits (daily, I assume), we certainly haven't proven that those people are actually "readers". a lot of the time we use "reader" to refer to everyone including hits, click-thrus, occasional visitors, and regulars--regardless of how any of these people/bots are actually interacting with our blogs. Probably worthwhile to distinguish if we are talking about techniques for introducing music, as they are going to be very different depending on the target audience (I think).
A huge problem to developing consistent techniques for "introduc[ing] arbitrary music to [a] random crowd and they actually enjoy[ing] it" is: how do you measure this? How do you measure your readers "actually enjoying" the music you post? (Not sure if this is possible.) Also, in order to develop consistent techniques, you need to first have a way to determine the success of whatever given technique you are applying. (i.e. you need to be able to say "when you used technique ___, this result occurred __% of the time.") More importantly, how will you know to any degree that what you are measuring has any relation to the "blogging mechanics" you used?
Those very important points aside. . .
As much as it could be considered a "technique", focusing on a specific genre has the advantage of possibly attracting people with similar music taste, and achieving loyal readers that will return to your blog. Most people are pretty unadventerous when it comes to their music--they don't want to be challenged to listen to something completely new. Being relatively focused on one or two musical styles, and occasionally throwing in something more "arbitrary" might be a good way to introduce people to something that they might not normally check out. It's also worth mentioning that the bigger your blog gets, the more traffic you get, the more sites linking to it, the greater the chance of somebody randomly happening across it, and giving something a listen.
On the other hand, a more eclectic blogging technique could attract more musically-adventurous readers. These people might be more open to your attempts to "rearrange [their] musical perception", than someone who just wants the latest electo-house jam, and is not looking to have their tastes challenged.
If your stated goal is to "rearrange musical perception" I don't know why you wouldn't use every opportunity you have to inject your own personality into the way you present the music. Presentation counts for a lot. If you are trying to get your audience to enjoy music that they might not normally listen to, it couldn't hurt to get them thinking about the music in a different way. Perhaps this is my own personal bias, but I would be trying to get that person on the same page as me. I'd recommend techniques that allow you to personalize the experience and play around as much as possible with the context in which the person is hearing the music.
a) text-based techniques: original journalism, academic writing, creative writing (fiction, poetry, etc.) You have to be careful with these, as they will alienate people who don't like to read/are unable to read what you've written (the vast majority of people on the internet). Illiteracy is something to consider, but also increasingly, the language divide is going to place limits on the effectiveness of these techniques, if it doesn't already.
b) image / video techniques: "a picture is worth a thousand words", etc. Generally speaking, people will see the picture before they read what you've written. It's all but guaranteed that the reader will see an image if it's placed at the top of the post. Videos are more tempting to most people than reading text.
c) organizational techniques: playlists, podcasts, dj mixes, top 10 lists, thematic posts, and tons of other things that are not coming to mind at the moment.
As for the argument for the impersonal, I suppose it is possible that the "reader" manages to sidestep all your attempts to impact the way they experience the music, and just downloads an mp3 without paying any attention to the blog. In that case, doing away with the time-consuming things that make your blog original frees up your time and resources for doing other things that could increase your ability to "introduce arbitrary music to [a] random crowd" like, I dunno, spam advertising.
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That's all I got for now, and I'm not in a position where I'm ready to say which of these techniques are "best" or "required" to achieve your goal, or that their varying impacts are able to be measured in any decisive way.
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