A quick way to learn intervals is to associate them song that you know well.
For exemple « Happy Birthday to you » begins with a Major second (2). So when you hear a interval that sound like the beginning of « happy birthday to you », you can easily identify it as a Major second.
This chart list reference songs for all major and minor intervals, both ascending and descending.
Each intervals have a different color to be helpfull.
A tool for professional musicians and students to alway have a song in your mind corresponding to a interval.
* Intervals listing from b2 to 8ve
* Interval formula ( step )
* 150 Songs listing by ascending or descending interval.