The whole reason for the original festival came to be the visit of Azazello to Norway. Azazello played on a Norway festival with Wild Willy's Gang (coverband featuring Willy Bendiksen and Jorn Lande). Azazello stopped in Moscow for a while so a concert with other bands was held. Responses were very good so it was decided to make it annual. However, because December isn't the best time for a festival it was moved to the beginning of the year, therefore year 2002 was skipped.
Most of the performers in this festival are progressive rock artists from Russia, but there are progressive rock artists from other countries too. The idea is to put well-known artists and unknown artists in the same concerts so more bands will gain recognition.
The organizers of this festival called it "a festival of intellectual music", because except giving to progressive rock artists to perform they also give to Jazz and other genre artists to perform. The official slogan of the festival is "Music for the brains".
Since the festival began in 2001 its popularity grew from year to year.
Though there was an InProg 2007 festival planned, it did not take place because of a low financial situation.
In 2008, after kind invitation of "Empty Hills" festival, larges uncommercial open air festival in Russia, InProg re-emerged as "InProg on the Hills", sort of "festival in festival". It took one evening on one stage ("Empty Hills" was 4 days and 4 stages with all kinds of different non-commercial music from blues and folk rock to rock-underground, jazz/fusion, progressive...).
And finally, upon finally getting a sponsor - Danish footwear company Ecco, InProg organizers decided to change its name for "Ecco Prog Fest". First "Ecco Prog" took place at 29 November 2008 in familiar "B2 Club", Moscow, with Swedish Flower Kings as headliners. Russian bands this times were Apple Pie from Kursk, Batisfera and Kostarev Group from Moscow.
"InProg on the Hills" was to continue on "Empty Hills'2009" festival. There was big progressive rock section planned, consisting Kostarev Group, Vespero, Jazzator, Disen Gage, Rada & Ternovnik, Symfusion Orchestra, Lost World, Apple Pie, The Worm Ouroboros, Aziris, Vespero. However, festival was nearly cancelled due to logistical problems caused by heavy rains. Most of planned bands were told to stay at home and only 3 bands were able to come to the festival location and play: Kostarev Group & Jazzator (12 June) and Vespero (13 June). Disen Gage first planned to arrive, but eventually things didn't work out.
2009th Ecco Prog Fest was planned at 24 October at "Yauza Palace", Moscow. However, because of financial reasons it was reverted to InProg Festival and moved to smaller venue DOM  (but on the same date). Musically the Concert was a big success and the organization went very smooth, but the whole tendency of decreasing audiences and lack of people's enthusiasm continued, making the future of the festival again very uncertain.
Meanwhile, the resque came from prog enthusiast from Yaroslavl' town, who offered to make local branch of the festival. New festival called "Yaroslavl' InProg" became a mix of musicians from Moscow and Yaroslavl' and happened, to local success, even twice in a year 2010.
"InProg on the Hills" has continued in 2011. A mix of Russian and Ukraine bands played there, including well-known Sunchild.
List of all festivals and performers
InProg on the Hills 2011 (10 June-13 June)
- Art-Nechto (Arkhangelsk-Moscow), Introspective F.M. (Yaroslavl'), Uphill Work (Moscow), Eternal Wanderers (Moscow), Cracked Rombix (Moscow), Sunchild (Kharkiv, Ukraine), Mystic Morrison Visions (Volzhskiy, Russia), Chikiss (St.Petersburg).
InProg on the Hills 2010 (11 June-13 June)
- Uphill Work, Syncopated Silence, Olga Dzusova & SS-20, Orgia Pravednikov (All - Moscow, Russia), Kusudama (Minsk, Belarus) - main progrock/metal/etc. set at 11 June. "Orgia" show was a big success.
- Vespero (Astrakhan'), Klever (St.Petersburg), Cracked Rombix (Moscow), Mouches a l'Orange (Soligorsk, Belarus) - psychedelic set at 13 June. Due to dysfunctional stage/weather conditions it was moved to different stage and went late night and in-between reggae (!!!) set; weird mix indeed.
InProg 2009 (24 October)
InProg on the Hills 2009 (12 June-13 June)
Ecco Prog Fest 2008 (29 November)
InProg on the Hills 2008 (12 June)
- Rational Diet (Belarus), Disen Gage (Russia), Inner Drive (Russia), Batisfera (Russia), EXIT project (Russia), Olga Dzusova & SS-20 (Russia), Kaftan Smeha (Russia).
- On 13 June, progressive rock bands Kostarev Group (Russia) and The Skys (Lithuania) also played.
InProg 2006 (9 April and 23 April)
- Day 1 - Vicheslav Gorskiy & Kvadro, EXIT project, Blind Vandal, Olle Lukoye, Kaftan Smeha, a Jam session of different musicians led by Alexander Kostarev, who was specially invited to lead the Jam session.
- Day 2 - Little Tragedies, Azazello, Extrovert, Nightingale (Sweden).
- All performers from Russia, except where noted.
InProg 2005 (14–15 May)
- Day 1 - Samla Mammas Manna (Sweden), Tanquam, Invisible Front, Andrey Suchilin and Do Major Neo.
- Day 2 - Olive Mess (Latvia), Hidria Spacefolk (Finland), Kostarev Group, Marimba Plus, Disen Gage.
- All performers from Russia, except where noted.
InProg 2004 (11 April)
InProg 2003 (15, 22 February)
- There was also a one-day InProg 2003 festival in Sankt Peterburg (16 February).
InProg 2001 (11 November)
- The festival organisers MySpace (English)
- About InProg 2006 (Russian)
- Review about the second day of InProg 2006 (Russian)
- Review about the first day of InProg 2006
- About InProg 2005 (Russian)
- Another information page about InProg 2005 (Russian)
- About InProg 2004 (Russian)
- Includes information about InProg 2003 and 2004 (Russian)
- Review about InProg 2001 (Russian)
- Empty Hills festival official website (Russian)