An electronic message is “spam” if (A) the recipient’s personal identity and context are irrelevant because the message is equally applicable to many other potential recipients; AND (B) the recipient has not verifiably granted deliberate, explicit, and still-revocable permission for it to be sent.
With that in mind..
[caption id="" align="alignnone" width="543"] Hand typed band spam[/caption]
Pretty simple folks. Ask for consent or it's spam.
Imagine the difference between pasting a message with a link and saying something like:
"My band is in a contest and I was hoping you'd be interested in checking us out.
Let me know if you're interested and I'll send you the link."
Not only does it feel better for the receiver, you'll actually get a much better response.