How do you search when you search the song you hear for the firstime?

Depends.. if it was live on the radio then I hope the DJ says what the song was, if it was on the internet then there is almost always info on who the song is being played by. Really if you want help finding a song then you need to say where, when and how you heard it. Most radio stations have a website and you can back search their play list to find the song, youtube provides a lot of info on the song and most uploaders provide the songs title and group info.