Laura Constance Netzel (née Pistolekors), b. 1 March 1839 in Rantasalmi, Finland, d. 10 February 1927, Stockholm, grew up in Stockholm and was both pianist and composer (from 1874 onwards using the sobriquet ‘Lago’). She studied composition under Wilhelm Heintze in Stockholm and Charles-Marie Widor in Paris. For many years she also worked as a concert arranger and orchestral director. Most of her compositions are in late Romantic, chromatic style, with touches of contemporary French music, and her work received coverage not least in French music journals.

Source: https://www.swedishmusicalheritage.com/composers/netzel-laura/