Every sound is created by a vibration of an object. Our ears perceive these vibrations and based on the frequency and length of sound waves, the nerves in our ears send different the signals to our brain. That is how we hear all the sounds, but music is different from other sounds, because it has certain elements that controls and sorts these vibrations and makes it pleasant and harmonic.
One of these elements is rhythm. That means music has some specific, regular pattern. It is not just random collection of sounds. Every sounds has its place and they are all put is specific order that usually repeats. That means all the beats are grouped together. These groups of beats are called meters. Meters make these patterns and that is what makes music organized. Rhythm is one of the most important aspects that separate different music genres.
Next one is melody. Basically, melody is notes put in specific pattern. Notes are actually the height of sound. That means the height of sounds is ordered in harmonic way. There can be simple melodies that contain only single scale and also melodies with many chromatic notes.
Then there is also a texture of music. It is rhythm and melody put together. These both elements together make the musical piece sound in specific way. For example if the melody is complicated and there are many instruments playing at the same time, texture is considered as thick. The single melody is dense. Texture also refers to width to highest and lowest notes.
Timbre is what describes the uniqueness of the instrument pay or voice of the singer. The same note in the same frequency can sound very different played on different musical instruments. Also the technique of instrument play can affect the timbre, so if the two different people will play the same instrument, it will not sound exactly the same. It also refers to voice – every person sounds different when singing the same song.
Expression is what makes music different without changing the rhythm or melody. It can be done by adding some effects to the voice or instrument play. For example musician can make notes longer or shorter, also can change the intonation of the notes or change a pitch a little bit. That can give musical piece different sense.
And the last one is form or composition. That is the overall structure of the song. You probably have noticed that most of the songs have versus and chorus and they are arranged in specific order. There can also be different forms, for example only versus or even something completely different. The most common forms have specific names for example, strophic form, binary form, rondo form, developmental form etc.
These elements are what make music different from all the other sounds. They make music catchy, favorable and pleasure. If music not like that, it is just bunch of sounds put together.