UPDATE 2-Soccer-Messi nets twice as Barcelona hammer Bayern 4-0

* Samuel Eto'o, Thierry Henry also on target

* All four goals come in first half at Nou Camp

* Klinsmann says focus for Bayern now is Bundesliga

* Guardiola says Barca to appeal Messi yellow card

(Adds Guardiola, Klinsmann quotes)

By Iain Rogers

BARCELONA, April 8 (Reuters) - Barcelona produced a stunning display of attacking football to overwhelm Bayern Munich 4-0 in their Champions League quarter-final first leg at the Nou Camp on Wednesday.

All the goals came in a thrilling first half, Lionel Messi netting twice and Samuel Eto'o and Thierry Henry once each as the Primera Liga leaders took firm control of the tie ahead of the second leg on Tuesday.