My first language was Basic (first on an HP-2000 timesharing system and then on the Apple II), but my second language was 6502 assembly, something for which I will be forever grateful - with the groundwork laid by assembly, C was a wonderful step up, handling all the tedious parts of writing assembly while allowing nearly all the same precision and control - reading the original K&R book was a transcendent experience. After those, other languages were easy.