Oasis starts with a slow introduction, each instrument beginning one after another. Then the guitar starts a monotonous accompaniment. The flute and violin play downward repeated notes getting more and more together. In measure 31 the guitar accompaniment is changing into strong repeated chords and the fl. and vl. are coming (rythmically) together. The guitarchords are taken over by the violin (m.38) and alternative the instruments play melody and chords resulting in meaure 44 where the 3 instr. are all together for one and a half measure. Then the beginning theme appears again.
In m. 57 for the first time there is a real change of atmosphere: A Vivace with a Spanish- Medieval character (quint/quarter intervals). In the Andante Maestoso (m.112) there is the same Spanish- Medieval character although now combined with the repeated notes from the beginning of the piece resulting in an even more old style: early Arabic music. Then at the end the first theme is coming back in stretto form to end with a very strong and powerfull Vivace.