A top Turkish pianist and composer appeared in court on Thursday to defend himself against charges of offending Muslims and insulting Islam in comments he made on Twitter.

Fazil Say, who has played with the New York Philharmonic, the Berlin Symphony Orchestra and others, is on trial for sending tweets that included one in April that joked about a call to prayer that lasted only 22 seconds.

Say tweeted: "Why such haste? Have you got a mistress waiting or a raki on the table?"

Raki is a traditional alcoholic drink made with aniseed. Islam forbids alcohol and many Islamists consider the remarks unacceptable.

Prosecutors in June charged Say with inciting hatred and public enmity, and with insulting "religious values." He faces a maximum 18 months prison term, although any sentence is likely to be suspended.

Say, who has served as a cultural ambassador for the European Union, rejected the charges and demanded his acquittal, according to the state-run Anadolu Agency.

The trial was adjourned until Feb. 18 and the musician was granted the right not to appear at subsequent court hearings due to his concert schedules.

Large protest by fans outside courthouse

The prosecution has caused anger among intellectuals in Turkey and escalated concerns over freedom of expression in the country. Hundreds of his fans, supporters and human rights activists went to the courthouse in Istanbul in a show of solidarity, holding up signs that read: "Fazil Say is not alone" and "Free Art, Free World."

Say, 42, is a strong critic of the Islamic-rooted government of Prime Minister Recep Tayyip Erdogan, a devout Muslim who has preached conservative values, alarming some secular Turks who fear the government plans to make religion part of their lifestyle.

Some have drawn parallels between Say's case and that of the Russian band Pussy Riot who staged an impromptu punk performance at Moscow's main cathedral in February in protest against President Vladimir Putin and the Russian Orthodox Church hierarchy. The three women were convicted of hooliganism motivated by religious hatred, but they insist that their protest was political in nature and not an attack on religion.

Prosecution of artists

Turkey has a history of prosecuting its artists and writers, and the European Union has long encouraged the nation to improve freedom of speech if it wants to become a member of the bloc one day.

In a report on Turkey's progress toward membership issued last week, the EU criticized Turkey for "recurring infringements of the right to liberty and security and to a fair trial, as well as of the freedom of expression." It said restrictions on media freedoms and an increasing number of court cases against writers and journalists remained "serious issues."

Turkish pianist and composer Fazil Say, seen in Paris in 2010, is being targeted for provocative tweets about Islam. Under Turkish law, anyone convicted of insulting religious values can be sentenced to between three months and one year in prison. (Fred Dufour/AFP/Getty Images)

Turkey's Nobel laureate Orhan Pamuk has been prosecuted for his comments about the mass killings of Armenians under a law that made it a crime to insult the Turkish identity before the government eased that law in an amendment in 2008. In 2007, ethnic Armenian journalist Hrant Dink, who received death threats because of his comments about the killings of Armenians by Turks in 1915, was shot dead outside his office in Istanbul.

On Thursday, Egemen Bagis, the minister in charge of relations with the EU, suggested the case against Say should be dismissed saying the court should regard Say's tweets as being within "his right to babble." However, he criticized the pianist for "insulting people's faith and values."

The charges against Say also cite other tweets he sent, including one — based on a verse attributed to famous medieval poet and wine-lover Omar Khayyam — which questioned whether heaven was a tavern or a brothel, because of the promises that wine will flow and each believer will be greeted by virgins.

Say has since closed his Twitter account and has said he plans to leave Turkey for Japan. His lawyer said Say has received some death threats.

The musician, known for his eccentricities on stage, has pressed ahead with concerts and recitals in Turkey despite his legal woes. Last month, he played to a packed auditorium in Ankara where people without tickets were allowed to sit on the steps of the aisles, and received a standing ovation for the recital that included his own compositions influenced by a traditional Turkish string instrument as well as a jazzed-up rendition of Mozart.