Jem Aswad Senior Music EditorOn a week like this, with a crushing onslaught of strong contenders for the coveted Fri 5, your faithful reviewer feels like an “American Idol” judge, with a whole load of self-imposed rules about what constitutes a great single (as opposed to a great song), trying to disregard considerations like how popular an artist is or isn’t, which record label it’s on, etc. Like…“The new Lil Wayne song ‘Life of Mr.