I am absolutely gaga crazy in love with his sound, I feel this is what the modern Austrian musical sound needed to be at the time (vs the second Viennese school ala 12 tone....). This sound like more of an evoluton of where Wagner was going but with favors of late romantic and Impressionism ( indeed its been said that Strauss can be seen as an extension of Wagner) and Marx along with perhaps Egon Kornauth probably react pulls back on things a bit to more of a gala Brahms while still still staying fresh while still lovely and ethereal not unlike Scriabin...Worth exploring. You mentioned an evocative arabesque. This one is quite so!I have audio of his prelude and fugue but cannot post for copyright. But it is in his six pieces for piano on imslp (score but only for some countries). Love this guy! Ps from the society pageThe unique "Marx sound" reminds the listener of Debussy, Scriabin, Delius, Ravel, Respighi, J. Jongen, Vladigerov, Reger, Schreker, R. Strauss, Korngold, Brahms, Mahler and Bruckner but is in the end totally his own. Regarding his Lieder for which he became famous (these were mainly composed before he was 30 years of age) he is said to be the rightful successor to Hugo Wolf. The southern atmosphere in many of his works has its origin from his mother who was half Italian half Slav. Marx was a late romantic impressionist whose musical inspiration was nourished by his deep and spiritual tie to Mother Nature to whom he wrote so many glorious hymns of love. This is why the mood of his music is so sensuous, optimistic and even hedonistic, a work of art created by a happy man who wants to share his delight with others.