What is the main difference between a dot and tie in music ?

A tie links two notes together to create a new duration. Ties occur between notes of the same pitch. A slur, which looks like a tie, is placed over or under notes of different pitches and means to play them in a connected manner. A dot added to a note increases the duration of that note by half.

Explanation:

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do you know the title of the listening so i can hear and answer this?