Released between 1991 and 2005, the selections in The Warner Recordings encapsulate the period when Pierre-Laurent Aimard was signed to Erato and Teldec, performing mostly 20th-century fare and some music from the 19th century. Aimard is famous for his contributions to the modernist catalog, and his performances of works by Pierre Boulez, Elliott Carter, György Ligeti, and Olivier Messiaen are regarded as scrupulously executed and authoritatively interpreted. Aimard also recorded early 20th century pieces by Charles Ives, Alban Berg, Maurice Ravel, and Claude Debussy, as well as Romantic masterpieces of Beethoven and Liszt. A pianist's pianist, Aimard is well-rounded in his repertoire and a true master of keyboard technique, yet he has received considerably less fanfare than many of his flashier colleagues. Yet connoisseurs of piano recordings know that Aimard is indispensible, especially for his special feeling for French music, and his recordings are important documents that serious students and newcomers should appreciate.

Alberto Rosado showcases some of the most significant modern composers in this well-considered programme. Inevitably he’s up against fierce competition, not least Pierre-Laurent Aimard’s recordings of both Ligeti’s Ricercata (included on the disc which received Gramophone’s Contemporary Award in 1997) and the complete Vingt Regards.

The unifying idea of the concerto provides a way to get a handle on György Ligeti's experimental spirit, for a concerto here represents several fundamentally different things. The Cello Concerto of 1966, right at the height of Ligeti's exuberantly fearless adventures in 1960s Germany, might almost be called an anti-concerto, with the cello doing its best to hang on the edge of silence. Sample the very first movement, both for the precision of cellist Christian Poltéra's work at the low end of the dynamic spectrum and for the ideally clean engineering work by the BIS label, operating in a variety of Norwegian venues and mastering them, well, masterfully. The Chamber Concerto for 13 Instruments and the Melodien are essentially concertos for orchestra, with distinctive roles for each of the instruments, while the five-movement Piano Concerto, completed in 1988, is a fine and technically demanding example of Ligeti's later pulse-based, polyrhythmic style.

The great recordings of the "Nordic choral marvel": Swedish choral conductor Eric Ericson was one of the true legends in his field. When he died in 2013 at the age of 94, he had spent decades working to place his two Stockholm choirs among the international musical elite. His recordings from the 1970's enjoy real cult status – unique interpretations of a cappella works from the Renaissance to the 20th century, from Gesualdo to Penderecki, released here for the first time in a single box.

In his opening remarks, Marco Blaauw admits that only latterly did he enjoy the extrovert tendencies of his instrument – and this recital “shows off” in exemplary fashion. Only Hanna Kulenty’s Brass No 1 is a truly abstract study: the first in a cycle of trumpet-centred pieces that puts the double-bell instrument as thoroughly and as scintillatingly through its paces as any music written from a non-jazz perspective.

2001: A Space Odyssey is a soundtrack album to the film of the same name, released in 1968. The soundtrack is known for its use of many classical and orchestral pieces, and credited for giving many classical pieces resurgences in popularity, such as Johann Strauss II's 1866 Blue Danube Waltz, Richard Strauss' symphonic poem Also sprach Zarathustra (inspired by the writings of Friedrich Nietzsche), and György Ligeti's Atmosphères.

György Ligeti's "Requiem" for soprano, mezzo-soprano, two mixed choirs and orchestra is one of his most impressive compositions - especially, when directed by Michael Gielen - and at the same time "the" requiem of the 20th century: Sound which is chromatically layered moves gradually from the lower registers to the higher, thus changing from mourning sounds into the promise of the eternal light. In the Kyrie the polyphonic net which was previously static begins to move gently. It was a part of this composition that Stanley Kubrick used to accompany the discovery of the monolith in "2001: A Space Odyssey". Also on this WERGO disc are two other essential works, "Aventures" and "Nouvelles Aventures", highly theatrical and justly celebrated choral works.

Stanley Kubrick made his own musical choices for his films, many of them existing pieces that were forever redefined by their use. (Remember "Thus Spake Zarathustra" in 2001: A Space Odyssey?) For his final work, Eyes Wide Shut, he employed composer Jocelyn Pook to compose some evocative string-filled music (including one track, "Masked Ball," eerily featuring backwards vocals), but his score also included works by Liszt and Shostakovich, syrupy versions of "When I Fall in Love," "If I Had You," and "Strangers in the Night," a jazzy rendition of "Blame It on My Youth" by Brad Mehldau, Chris Isaak's cross between John Lee Hooker and Roy Orbison on his 1995 song "Baby Did a Bad, Bad Thing," and, opening and closing the disc, a simple but intense solo piano piece by Gyogy Ligeti, whose work also had been used in 2001 and another Kubrick film, The Shining. The result was an eclectic soundtrack album that primarily was of interest to fans of the film who were in need of an aural souvenir.

Viola Space in Tokyo is one of the world’s most important musical festivals dedicated to the viola and the music composed for it. Founded by Nobuko Imai – well-known to BIS followers as well as to lovers of the viola – it celebrates its 10th anniversary, and BIS was invited to document some of the 150 works that have been performed over the years. The program spans over more than 70 years, and the list of composer includes Schnittke, Per Nørgård, Penderecki and Oedoen Partos. Nobuko Imai herself performs two of the most exciting works on the two discs: György Ligeti’s Sonata for Viola Solo and Toshio Hosokawa’s Voyage VI for Viola and Strings. This last piece was composed only last year, and is dedicated Nobuko Imai. It forms part of a series of concertos “in which the soloist symbolizes man while the ensemble represents the universe, nature and world that surrounds us within and without”, in the composer’s own description. Among these a modern classic such as György Kurtág’s Hommage à R. Sch. – in which violist Junji Suganuma is joined by a clarinet and a piano – may be mentioned, as well as Viola, Viola, a constantly surprising duo by George Benjamin.