Rapid Evolution (also known as RE) is a freeware software tool for DJs, providing filtering and searching features suitable for musicians. It can analyze audio files and automatically determine properties such as the musical key, beats per minute (BPM), beat intensity and ReplayGain.
It supports file types MP3, MP4, WAV, FLAC, OGG, AAC and APE. It helps DJs to organize and profile their music, and assists in the process of mixing music by utilizing song metadata to be able to show harmonically compatible songs and songs of a similar style. It allows DJs to save and remember which songs are good matches (like a personal, digital mixing journal) and to plan entire mix sets.
One of its uses is to assist in a DJ technique called harmonic mixing. Once the musical key and BPM is known for a set of songs, DJs can use music theory (such as the Circle of Fifths) to identify songs that are harmonically compatible. The act of mixing harmonically can help eliminate dissonant tones while mixing songs together. Since identifying whether songs can be made harmonically compatible can be quite complex (once features such as pitch lock are introduced), the software assists DJs by being able to show them which songs in their collection can be made harmonically compatible with any particular song. It can also assist DJs in the act of beatmatching by showing which songs are in a compatible BPM range, and the percent of BPM difference.
Rapid Evolution is created and released through Mixshare.com. The metadata generated by Rapid Evolution is shared through the central servers at Mixshare.com, which can be browsed online. There are 1 million songs added to the database sharing information such as key, BPM, styles and ratings.
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