Barcelona reached the Champions League semi-finals after drawing their last eight second leg with Bayern Munich to seal a comprehensive aggregate victory.Facing a 4-0 first-leg deficit, Bayern made a strong start with Luca Toni and Franck Ribery going close early on.Ribery rounded Victor Valdes to put the hosts ahead after half-time but they did little to extend their lead.Seydou Keita produced an emphatic first-time finish to level and set up a last-four meeting against Chelsea.The Premier League side drew 4-4 with Liverpool in the second leg of their tie to go through 7-5 on aggregate.Barca and Chelsea will meet for the fourth time since 1999-2000, with the first leg at the Nou Camp on Tuesday 28 April and the second at Stamford Bridge on Wednesday 6 May.Josep Guardiola's men will be full of confidence going into that tie after seeing off Bayern so comfortably.The damage was done six days earlier in Spain and under-pressure Bayern boss Jurgen Klinsmann admitted before the game it would be "unrealistic" to expect his side to progress to the semi-finals.But the four-time champions began as if intent to do exactly that and, backed by a vociferous home crowd, they attacked Barcelona from the outset.The orchestrator of Bayern's attacking play was Ribery, the Frenchman coming in from his position on the left to break forward at every opportunity.But it was Jose Ernesto Sosa on the opposite flank who created the first meaningful chance as he crossed from the right to an unmarked Toni, who failed to connect sufficiently with his header from a glorious position six yards out.Aware that an early goal was surely necessary if they were to stand any chance, the hosts continued to probe for a breakthrough and Ribery turned Barca captain Carles Puyol inside out before shooting narrowly over the bar.Bayern had overturned seven of their previous 17 first-leg deficits in Europe's top club competition but all of those were by one goal and a four-goal first-leg deficit has never been overturned in the Champions League.And their hopes began to fade as Barca weathered the early storm and gradually began to assert their authority.Despite Guardiola having to watch the game from that stands after being sent off in the first leg, the visitors needed no prompting to impose their slick pass-and-move game on proceedings.Lionel Messi was, predictably, at the heart of their intricate patterns and caused the home defence no shortage of problems with his nimble dribbling and incisive through-balls.But, apart from a blistering Daniel Alves drive that sailed marginally high and wide, chances were few and far between for Barca and two minutes after half-time they were behind.Ze Roberto sidestepped Yaya Toure to slide Ribery through on goal and he neatly took the ball past goalkeeper Valdes before coolly slotting it high into the net.But Klinsmann's men failed to capitalise on their momentum and it was Barca who took the initiative to ensure their would be no late drama.The impressive Andres Iniesta put Messi through on goal, only for the Argentine to be incorrectly flagged offside when one-on-one with Hans Jorg Butt, and then Samuel Eto'o was denied by Lucio's perfectly timed sliding tackle after Messi's run and cross.An equaliser seemed inevitable and it arrived when Keita pounced at the end of a mind-boggling 17-pass move, primarily involving Eto'o, Iniesta and Xavi.Spain midfielder Xavi curled a free-kick inches wide just before the end but by that point Barca's passage into the last four had long since been secured.Source: BBC