The Nigeria winger arrived at the Boleyn Ground on a season-long loan from Chelsea as the Hammers celebrated historic back-to-back Premier League away victories at Arsenal and his former club Liverpool.
The east Londoners are widely considered to have done some of the best business of the summer overall, many citing the signing of Moses as a case in point.
The powerful star is already feeling at home in East London.
'I'm here to help'
“We already know Andy Carroll is a great striker and he has lots of experience in the Premier League, as do Jelavic and the other strikers we’ve got here as well.
"If I can help them to score goals this season, that will really help."
West Ham stars will relish playing with Moses
While Moses may be looking forward to playing with that trio, it is they who should be licking their lips at the prospect of welcoming him into the team.
The pacy star was handed a brand new deal by Chelsea before completing his loan move across London, which gives an indication of how highly thought of he is at his parent club.
And that is because he brings so much to the team including goals, assists and plenty of hard work.
Presence will open doors that were shut last season
His presence will give Song far greater options when he has the ball this season. Last season, Song was often ready to play a killer pass but did not have team-mates of sufficient quality to read what he was trying to do.
And for Carroll and Jelavic, Moses should quite literally mean goals.
The wing man is very unselfish and, when he's not tracking back to help out his team-mates, he will be terrorising his opposing full-back with a view to supplying the strikers with ammunition to get their goals.
The new West Ham star is also not afraid to have a go himself, often coming up with the odd cracker when he cuts inside off the wing.