Malats died in 1912, and his music is in public domain, right?
Tarrega transcription of Serenata Española is also in public domain.
Serenata Española can be easily found online for free, for example at Thorlaksson's classicalguitarschool.net, or at *** Site blocked for copyright reasons ***. It is also offered here by Msr. Delcamp in D09 or here: http://www.delcamp.net/pdf/joaquin_malats_serenata_espanola.pdf
Serenata Andaluza can be found at *** Site blocked for copyright reasons ***