Wich song or solo is not so easy and not so hard(medium)?
Pref. Metal but any other is good

M+M's by blink 182 and back in black by ACDC, both fairly easy but take some skill.
I'm a dirty fuckin' punk / i sell myself for a beer
I would take it that Breaking Benjamin and Three Days Grace have plenty of killer solos that are somewhat simple but also require a knowhow around the strings. A7X's solos are much more on the speedier side of hammer ons and pulloffs, as well as Blink 182's solos. AC/DC's are somewhat on the easier side of things, but their grooves can't be beat. ...although there are plenty of other bands' songs that are medium difficulty as well; just can't list them all due to there being simply too many of them