One of the most creative and originative Polish jazz drummers, a composer, an author of theatrical and film music, a producer. He played with many jazz legends: Kenny Werner, David Murray, Chris Speed, Erik Friedlander, Herb Robertson and William Parker. Together with his brother Marcin Oleś they are Oleś Duo formation; with German clarinet player Theo Jörgensmann they are Oleś | Jörgensmann | Oleś and with American alto sax player Rob Brown they are Oleś Brothers w/ Rob Brown.

He was born on the 4th of January 1973, In Sosnowiec (south of Poland). He was fascinated by music since he was a child, drumming and playing with rhythms using sometimes strange and peculiar items: a ruler, pencils or a flute cleaning rod. When he was 13 years old his father (contrabass teacher and conductor) persuaded him to start studying music in drums class. He was studying classical repertoire playing the marimba, the xylophone, the vibraphone, the timpani and a snare drum. During this period he was fascinated by drum sets and influenced by Buddy Rich he completes his first drums in 1988.  Around that time he also starts playing in a local band called Osobowość Przyrody. When he was 18 he received his first professional proposition and played with Blustro Blues Band during recording Na Kolanko album.

The turning point for him was however the music of Billie Holiday and album by Charlie Parker Anthropology, through which he discovered jazz. Influenced by Parker he was trying his hand at playing clarinet. For year he was learning clarinet but the connection with drums was stronger.

Playing in local rock bands, formation Blustro and marching bands he continues his musical education in Łódź, in Witold Grabowski percussion class. He was getting deeper into Jazz however. Apart from classical music he studied great masters of drum set Elvin Jones, Max Roach, Art Blakey, Tony Williams, Vinnie Colaiuta, Steve Gadd and others.  

In the 90’s it was time for finding his own style and when he was fascinated by jazz-rock, electronic music, acoustic jazz that resulted in creation of a formation Custom Quartet – CQ. CQ repertoire was jazz standards and after a year this formation transformed into Custom Trio which played mainly music composed by Bartłomiej Brat Oleś.

Custom Trio, with a line-up Krzysztof Kapel – sax, Marcin Oleś – double bass, BBO – drums, made its debut in 1999 with an album Mr. Nobody. One year later the group teamed up with legendary polish trumpet player Andrzej Przybielski and recorded their second album CT & Andrzej Przybielski Free Bop. The cooperation was concluded by an album Back Point in 2002, which established the position of the band described by professional music press as a “revelation”.

In 2002 worked together with festival Era Jazzu, an international project, which expanded beyond jazz boundaries. The Contemporary Quintet was based on work of polish contemporary composers Grażyna Bacewicz, Witold Lutosławki and Krzysztof Penderecki, played by German bass clarinet player Rudi Mahall, Romanian pianist Mircea Tiberian and American french horn player Mark Taylor. Contemporary Quartet plays... was chosen the album of 2002 by Audio-Video magazine.

During years 2001-2003 they co-created formation Oleś | Trzaska | Oleś and recorded albums Mikro Music, la Sketch up and Suite for trio + – with guest appearance French trumpet player Jean-Luc Cappozzo. 

In 2003 together with his brother establishes a formation Oleś | Jörgensmann | Oleś. Theo Jörgensmann is a German clarinet virtuoso and he plays with the formation till now. Hitherto the following albums were published: Miniatures (2003), Directions (album of the year 2005 by Diapazon), Live in Poznań (2006) and Alchemia (2007) which was produced by Swiss record label – Hat Hut Records. 

The first album, FreeDrum Suite, published In Poland composed for drums only appeared in 2004. BBO is also the author of album Shadows recorded together with an American pianist Kenny Werner and Marcin Oleś – it was chosen the best album in the world in 2006 by Polish Radio Krakow.

He founded Fenommedia Records, recording label, together with Graphic Design Studio Fenommedia in 2005.

In 2007 a new project was created Marcin & Bartłomiej Brat Oleś DUO – one of the most original and unique in his career to date. Oleś DUO – an extremely rare in jazz music for double bass and drums - demanding lots of virtuoso. The first album Duo was published in 2008. This project broke jazz stereotype of rhythmic section and proved that double bass and the drums are sufficient to create music so complete, full of energy and unusual sounds. This project permanently evolved and the brothers were working on a new album. 

As a leader, co-leader and a side-man he appeared with David Murray, William Parker, Herb Robertson, Ken Vandermark, Mark O’Leary, Michael Rabinowitz, Stanley Jordan, Simon Nabatov, Anthony Coleman, Hamid Drake, Christopher Dell, Adam Pieronczyk, Frank Gratkowski, Emmaluelle Somer and others. He participated in the following festivals: Jazz Brugge, Montreux Jazz Festival, Kerava Jazz Festival, Jazz en Nord, Jazz Meeting Berlin, Luneburg Jazz Festival, Jazz Cerno, Warsaw Summer Jazz Days, MediaWave and others. 

Apart from jazz compositions created for consecutive projects, BBO is also an author of theatrical music, to mention only few: Measure for Measure and Othello by William Shakespeare;  Nora by Henry Ibsen; one-act-plays by Yukio Mishima, Andrew Bovell Speaking in Tongues. His creation reached film as well Futro and animated films.

Barłomiej Brat Oleś is an endorser of drumsticks by O4D Osca4Drums for which he designed a model of drumsticks signatures his own name.