Malats died in 1912, and his music is in public domain, right?
Tarrega transcription of Serenata EspaÃ±ola is also in public domain.
Serenata EspaÃ±ola 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 classclef