Learn to scout a song before you play it

It's always a good idea to scout a song before you play the song. In other words, take a look at the key signature and the time signature and see if there's any repeats in the song. In the key signature note which sharps or flats or being used. If there is one flat in the key signature then the song is in the key of F. if there are two flats in the key signature then the songs in the key of B. flat. If there are three flats in the key signature then the song is in the key of E. flat. If there are four flats in the key signature then the song is in the key of a flat. If there are five flats in the key signature, the key is D. flat. If there is six flats in the key signature, the song is in the key of G. flat.
 If there is one sharp in the key signature the song is in the key of G. If they are to sharps in the key signature the songs in the key of D. If there are three sharps in the key signature than the song is in the key of A.If there are four sharps in the key signature the song is in the key of E.  If there are five sharps in the key signature the song is in the key of B. if their sex sharps in the key signature of the song is in the key of F. sharp.
As far as time signatures are concerned, be sure to notice the top number of the time signature. That tells you how many counts are in each measure. The bottom number of the time signature tells you what kind of note gets one count.