I'm selling a 468x60 banner ad at the top right corner of our guitar forum. You'll have to contact me for the URL, a price offer and how long you want the ad for. We currently average 800 unique visitors per day. Mostly male musicians/guitarists of all ages. Your banner will be rotated with 2 other banners.
They rotate equally so that each banner gets a fair amount of impressions. The 2 banenrs I have up right now have been up and rotating on my forums since may 1st, and they both have around 6,200 impressions each as of right now. With another banner up, all three banners would get over 4,000 impressions each within 6 days.