The three-hour closing concert was especially illuminating : after a section that included striking works by composers from Ethiopia -LRB- Getatchew Mekurya -RRB- and Canada -LRB- Derek Charke -RRB- , as well as the quartet 's arrangements of short pieces by the Icelandic rock band Sigur Ros , the Kronos joined forces with the Indian singer Asha Bhosle for an extraordinary performance of film songs by Ms. Bhosle 's husband , Rahul Dev Burman .