This past 1 June at the Teatro de la Maestranza in Seville the Real Orquesta Sinfónica de Sevilla conducted by Pedro Halffter performed the world premiere of this work by the Madrid composer Jesús Rueda. La Tierra is an appendix to Gustav Holst's suite The Planets. Rueda's piece, of a length similar to those of the English composer, is subtitled 'la mare gaia' (Mother Gaia) and translates the author's personal idea regarding the planetary spirit as a "vertiginous turbine". This is a virtuoso work for orchestra which stretches the limits of the instruments, especially in the formal aspect, and is notable for its intense tempo. The composition was co-commissioned by Fundación Autor and the SGAE (Spanish Society of Authors and Publishers) and the Seville Symphony Orchestra with its principal conductor Pedro Halffter. Also by the same author, Tritó has recently published the score of Memoria del Laberinto for violin, cello and piano. This latter piece was recorded on a CD by the Arditti Quartet with Ananda Sukarlan on piano, published by Fundación Autor.