Progressive house is an electronic music genre that emerged in the 1990s. It is characterized by a typically moderate tempo, melodic and atmospheric melodies, complex harmonic progressions, and subtle transitions between musical elements. Progressive house is often associated with an ethereal ambiance and a gradual buildup of intensity throughout the track.

Here are some key characteristics of progressive house:

1. Musical Progression: Unlike other subgenres of electronic music, progressive house is known for its slow and steady progression. Tracks evolve gradually over time, with layers of melodies and instruments being added progressively.
2. Melancholic Melodies: Progressive house is often associated with melancholic and emotional melodies, contributing to a rich and deep atmosphere.
3. Synthesizer Use: Producers of progressive house often use synthesizers to create ethereal sounds and soundscapes that give the music a spatial feel.
4. Building and Storytelling: Progressive house is often constructed like a musical story, with a calm introduction, a gradual buildup of energy and intensity, an emotional peak, and a soothing conclusion.
5. Inclusion of Breaks: Progressive house tracks may include "breaks" or moments of pause in the music, creating contrast between calmer moments and energy peaks.

Progressive house was popularized by artists such as Sasha, John Digweed, Paul Oakenfold, and others, and it has evolved over the years to include subgenres and variations. It is appreciated by many electronic music enthusiasts for its sophisticated approach to musical composition and its immersive atmosphere.