Hidrogen – 2003 review of compact disc Conjunts i Banda of the Associció          Catalàna de Compositors, Vol. 5 Anacrusi

"Special mention should be made of the virtuosity of the musicians: Grup XXI, Quartet de Percussió de Barcelona, and the Banda Municipal de Barcelona. The works that stand out amongst the others are Awakening the Inner Voice, Tripercussió and De zon schijnt toch wel (by Christiaan De Jong)."

Catalunya Música Magazine: 

"New catalonian Music and..." (September,’03 announcement of the ‘03-04 concert series of the Associció Catalàna de Compositors).

"On the other hand, Grup XXI directed by Peter Bacchus returns with an substantial program which includes music of Amargòs, De Jong, Casablancas, Lara, and Takemitsu. In view of the level and solvency that Grup XXI has  shown on previous occasions, we have high expectations for their appearance this year on the series (November 14 at the French institute). It is a group of high level that Bacchus has forged and put together with excellent results."

“Interesting Programs in Avuimúsica” (concert November 14, 2003 at the   Institute Française in   Barcelona): 

"In the comfortable concert hall of the French Institute we were able to applaud with great satisfaction the performance of  Grup XXI, which is directed by Peter  Bacchus and Angel Pereira. Luckily, it appears that they have found the way the to continue in their work. In reality, the life of a chamber group in Spain is not easy these days. The Orquestra de Cambra del Teatre Lliure has recently disssappeared from the horizon, and before that,  the once promising group Barcelona 216 has effectively gone into hibernation. In light of these events, we would truly wish to be able to continue reviewing the future concerts of Grup XXI. Without entering into comparisons, it should be said that in their manner of working on new music we perceive a sincere drive to deeply explore the inner life of the new pieces they premiere and perform. There is a finely honed  mental discipline and capacity for identifying and bringing to life the ideas of contemporary composers. There are no comfortable attitudes of minimum effort for resolving problems in the process of reading a new and difficult score. All of  the group's members and it's director show a disposition and desire to bring to light the positive and communicative of each piece, and with an efficient and consummate technical level. They are familiar with the latest currents and esthetic trends and they transmit it all with great sensibility. 

We were able to see this in the expressive subtlety with which they gave to the reading of Heptandre of Joaquím Homs, and in the taught still relevant version of the Chamber Symphony No. 1, Op. 9 by Arnold Schoenberg, seventy years after it's conception. We also found the same level of expressiveness and detail in the ironic Mareas de Todos Colores of De Jong, in the interesting and naive Perelision of Ada Gentile, as well as the known and established scores, Sextet mixt (a notable example of dodecaphism of Salvador Brotons), and in Epigrames of Benet Casablancas.

 EL Pais (concert of the Associció Catalàna de Compositors. April 21, 2005)

 “The argentinian composer Jorge Liderman dedicated Flautando (2004) to Peter Bacchus, fine soloist, and to the stupendous Grup XXI, and it was solidly conducted by Salvador Brotons.” 

“With a speculative spirit, but of superior musical value, we then heard Esprit Rude/ Esprit Doux II de Elliott Carter, with the good work of Cortadellas, Castillo and Pereira.