The music of pianist/composer Juan Maria Solare hovers between the serious and the light, the traditional and the avant-garde. Solare was educated at the Conservatorio Nacional in his native Buenos Aires, then studied in Germany with composers such as Lachenmann and Kagel. He teaches in Breman -- where he leads one of Europe's very few university-level courses in tango music -- and conducts the Jacobs Chamber Orchestra, the Bremer Orchester Gemeinschaft, and the university's Ensemble Kagel. Some of his works are for acoustic instruments and others use modern techniques such as...