When we encounter the most popular White opening against 1.e4 e5 Giuoco Piano, or so called Italian the majority of players prefer 3...Bc5. I am pretty sure that there will be many players, who would prefer to have Black bishop on e7, or avoid some of the White alternatives to slow Italian ( set-up with d3). It can be achieved through 3...Nf6 move order, but not everyone like to study 4.Ng5 line and all complicated positions, which are happening after 4...d5 5.exd5 Na5 6.Bb5 c6 7.dxc6 bxc6 etc , which you can already find on my web page. Therefore I believe it would be a great news for Black players to know that 5...b5 is viable alternative to well-established theory.