ok i need help with time signaturs. i know that when it sez something like 4 4 . the 4 on the top is how many beats per measure but the bottome is what confuses me i meen isnt it like something like quarter note gets the beat. can you help me out explain it with great detail.also explain other times to me such as common time. i should already know this its just i have forgot it cause i havent really used it.