Good question. Gradual has a relevant point but I don't think it applies in this post since you're asking
. You don't seem to have a problem being creative and writing across the genre's.
Let's look at this from the listeners perspective. When I was a lot younger, I only listened to 45's. I listened to the top 20 singles. I couldn't waste what money I had on an album which at that time, I thought contained irrelevant rubbish as the album songs we're nowhere near Top 20 quality (oh little did I know haha).
There were of course those bands that only ever made albums (I'm talking about a long time ago). They had a fan based who idolised them and they fit into a niche market - mostly heavy rock I'd say or psychedelic perhaps. Anyway, suffice to say I never heard any of that rubbish either (remember I'm a kid talking here).
But my older siblings who could afford albums, I began to hear the artists range. My own choice of music as a teenager meant I had an abundance of singles and it wasn't until later and older that I did a U turn and dived into albums. That was yesteryear.
Moving on to today. I've just watched "I Need That Record: The Death (or Possible Survival) of the Independent Record Store" from 2008 and this brought back a lot of memories though the documentary is based purely on America. Such stores were full of Albums (vinyl) and everything was split into genre's etc (dinosaurs like me like it this way). Today we have less albums and more singles because of the internet and artists trying to always crossover (and often failing badly). Yes, albums are out there (CD's) but what a load of rubbish (in general) and that's me talking now as an adult. Funny how that hasn't changed for me and yet it has. You see the old albums when I began to buy them sent me on a frenzy to catch up with all the amazing music I'd missed buying singles, that were on the albums. Now I feel it really is a waste of money to buy an album as there's only a few tracks worthy on them with multiple versions of the same song, so return to buying only singles.
But I want to buy albums! Buying singles I may as well just wait for the next "Now That's What I Call Music ...... 3704".
Napster (never used it) paved the way along with MP3.com for being able to dload your favourite songs so you could do your own mixtape. Ipod's & ITunes just made it legal.
This may all seem nonsensical and off topic but the point I'm hoping and trying to make is who is going to like your music? Kids, 20 somethings, die hard punks, Mums with a soft touch for ballads, Dad's wanting their old rock tunes? Will it be on CD or as a dload? Have you got sufficient material to split and so cater for more than one group? What do kids want? What do Mum's want? And I'm meaning by this, a single or an album, a dload or a cd?
So the answer to your question is identify your market (including age). If you've got different styles across different genre's, without a lot of expensive help and direction from people who know what they are doing, don't mix apples with oranges so much. Think of an artist that appeals to every group? I can't. I maybe able to think of a song that appeals to most groups but buying that artists album, most groups would never play the album again.
Are you getting what I am saying?
Let's take a universal icon such as Stevie Wonder or Whitney Houston or Robbie Williams. Whose album would you buy today and why? I wouldn't buy Stevie Wonders because I love his old stuff. Whitney's, well she's trying to be mass appealing and current by mixing ballads with disco and rap and hip hop and she's lost her soul to me, so I don't buy hers anymore. Robbie Williams will be the one for me and I don't really like his music - so go figure that equation out.
I will say in complete contradiction though, be careful how you start out. What I mean by this, I'll use the following two examples.
I heard Curtis Stigers perform on the TV (a long time ago), liked the song so bought the album (I was an adult at the time so in the album buying part of life) and liked it. I bought the next album and enjoyed that too. I recently bought 2 new albums without really looking at them. He's gone back to his roots - jazz. The 2 albums are basically jazz standard covers. A disappointment.
Long time ago, there was a song called "I Don't Want A Lover" by a Scottish band called Texas. I bought Southside and it was so far removed from my music tastes, for some unearthly reason I loved it as I did Ricks Road, Mothers heaven etc. They stayed true to a sound and style I found unique. They had a solid fanbase, not really large but obviously enough to keep them signed up. Then someone stepped in and commercialised them with White On Blonde. I've never bought anything by them since.
So I gather you are hoping to be what your songs are and by that I mean you want to be the writer/composer/singer. So for me you need to pick say a couple of styles to give you some variety. You need to choose and decide which market you want to sing for. You need to choose and decide how people will listen to your music (cd or dload). In whatever order you decide these choices (and more), you should get your answer as to what to include.
I'm lucky, I just want to write so I don't have to worry about this.
Hope this has been of some help (to someone)