Geography has a way of seeping into music, and this week on the airwaves, we experience that in full effect with the return of Calexico. Throughout the group’s 22-year existence, co-founders and multi-instrumentalist Joey Burns and John Convertino have drawn on the arid climate and vibrant culture of the American Southwest — and its sister territory across the border — to inform their sprawling, cross-cultural indie rock. Also with us this week is prolific singer/songwriter Eric Andersen whose career has spanned 45 years (he just released his 25th album of original songs). Plus we’ll have a conversation with Monte Belmonte, a radio host (with WRSI in Massachusetts) and the founder of Monte’s March, an annual march against hunger, which aims to raise awareness about food insecurity and to collect funds to support the food bank in his area.