Some of the instruments played in the concerts have been made by Antonio Poves. Sometimes, the richness and requirements of the production make the collaboration of other highly-qualified soloists necessary.

Dos imágenes del concierto celebrado en la colegiata de Roncesvalles, Navarra en agosto de 1999. Antonio Poves toca el organistrum, reproducido por el autor, ayudado por otra persona para accionar la rueda y producir la melodia. En esta ocasión Antonio Poves intervino de solista con la orquesta y coros de la catedral de Pamplona bajo la dirección del maestro de capilla Aurelio Sagaseta.

Picture taken in the cloister of the monastery, although the concert took place in the refectory; October 1997.
Antonio Poves playing the “organistrum” ( reproduction of the one from the Portico de la Gloria) was helped by Raquel Esteban, and Manuel Waldesco Balaguer-Cortes played the tambourine.

The concert took place in July 2002, forming part of the acts of the “III Feria de Constuctores de Instrumentos Musicales. Conspiremus”. On this occasion, Antonio Poves was helped by Manuel Waldesco Balaguer-Cortes, Zulaima Boheto, Celia Carballo and Rebecca Levene.

“In Frías Castle, it was my pleasure to contribute, as part of the acts of the medieval festival in August 2002, a little bit of music using the magnificent and extraordinary instrument that is the ‘organistrum’,” says Antonio Poves.

September 1st 2002, in the incomparable setting of the "Cerco de Artajona" church, with the benefit of a very cordial audience, a most special atmosphere of music was created in a traditional setting.
The participants in this concert were: Manuel Waldesco Balaguer-Cortes, Zulaima Boheto, Celia Carballo, Rebecca Levene and Antonio Poves, plus one or two spontaneous participants who joined in at the end; upon the conclusion of the concert, the musicians found themselves the subjects of photographs with members of the audience.