Fr�hling is also a project that decisively sheds light on the figure of Andr�s Isasi (1890-1940), one of the most singular and underrepresented composers of early 20th-century Spain. At the heart of the album, Goikoetxea and Fern�ndez Aguirre offer the world-premiere recording of the complete Lieder-Album op. 16, a cycle composed in Berlin in 1913 and virtually unknown until today. These fourteen songs reveal a cosmopolitan Isasi at a moment of full creative maturity, shaped by his Central European training with Engelbert Humperdinck and attuned to the late-Romantic and Jugendstil currents of his time. The cycle blends intimate lyricism, legendary evocations, decadent impulses, and a refined harmonic language of striking modernity. Works such as Ali Bey, Fr�hling, Die ungetreue Luise, or Vergiftet sind meine Lieder display a uniquely personal voice that bridges the German Lied tradition with Basque imagery and an advanced European sensibility that was unusual for it's time. Goikoetxea and Fern�ndez Aguirre stand out for their elegance, their textual insight, and their ability to convey the emotional universe-at times na�ve, at times shadowed, always intensely poetic-of a composer whose vocal output was long overdue for a first-rate artistic rediscovery. The programme is framed within a broader exploration of Heinrich Heine's profound impact on European music. The album is completed with lieder by Liszt, Grieg, Ives, Rubinstein, Boulanger, Backer-Gr�ndahl, MacDowell, Sgambatti, and Castelnuovo-Tedesco, composers who, like Isasi, were captivated by the emotional depth and symbolic power of the German poet.