This video about Note Duration’s Per Measure explains how many beats you can achieve within a measure in music. If a Time Signature in music is in 4/4, it doesn’t necessarily mean you receive 4 quarter notes in that measure. Rather, it means you receive the duration of 4 quarter notes – which could mean any permutation of notes adding up to 4 full beats.
Still confused? Don’t be, simply watch the tutorial above until you understand it – I promise you’ll get it!