So, now you wait, YUP you wait until the calls start coming in from all the friends that heard your tune on the radio. You wait for all those labels to see what a real buzz you're creating. You wait until those contract offers start pouring in. Then you'll see if it can log viable air time. The cost is far more appealing and if it doesn't fly, either try another or find a new hobby.
Many radio stations do their entire programming without spinning a disk or using a tape.
Music stored on their computer, or on the Program Consultant's computer is played over the air direct. Going to a label with an unproven product will get you the door these days. AND generating airplay is the most important part to selling music. So if it can, you have proof in hand, a track record if you will. Then you are negotiating on an even playing field.