Joseph Wilson And Hernan Munoz, The Associated PressBARCELONA, Spain - The imprisonment of a rap artist for his music and tweets praising terrorist violence and insulting the Spanish monarchy has set off a powder keg of pent-up rage this week in the southern European country.The arrest of Pablo Hasel has brought thousands to the streets for different reasons.Under the banner of freedom of expression, many Spaniards strongly object to putting an artist behind bars for his lyrics and social media remarks. They are clamouring for Spain's left-wing government to fulfil its promise and roll back...…Joseph Wilson And Hernan Munoz, The Associated PressBARCELONA, Spain - The imprisonment of a rap artist for his music and tweets praising terrorist violence and insulting the Spanish monarchy has set off a powder keg of pent-up rage this week in the southern European country.The arrest of Pablo Hasel has brought thousands to the streets for different reasons.Under the banner of freedom of expression, many Spaniards strongly object to putting an artist behind bars for his lyrics and social media remarks. They are clamouring for Spain's left-wing government to fulfil its promise and roll back...WW…