e-Xpressor is the first auto-accompaniment maker creating ready chord progression to a tune. Easy and friendly interface. Accessible to all. No musical learning is required. Simply load MIDI melody and you get real instrumental accompaniment, as if made by a musician playing chords by ear. e-Xpressor is designed for people who want to compose songs and play accompaniments by ear with a computer and sound card, as well as for all people who love music and wish to educate of ear to music. The main features of e-Xpressor: 1.No knowledge of notate, chord names, keys etc. are required. 2.Parses structure of melody and automatically recognizes its key and harmony. 3.Generates chords for each bar of the tune and writes its in separate MIDI channel. 4.Creates also several chords which can be used as replacements in each bar of composition. 5.Offers convenient accompaniment edit interface permitting to change the chord progression by ear. 6.Offers accompaniment styles for guitar or piano depending on the musical characteristics of the tune. 7.Auto-arranger mode. 8.Supports MIDI and XPR files. 9.Supports General MIDI Set. Minimum melody requirements for auto-accompaniment making: a. the tune must be single-voiced.b. the tune should not be short: it is better, if it contains not less than 8 bars.c. the tune should not be too primitive (no on five notes).