Is sitting down playing a piano during singing the national anthem crime?

It is generally not a crime to sit down while playing the piano during the national anthem in the United States. While there are certain protocols and customs associated with the national anthem, such as standing up and placing one's hand over the heart, there is no federal law that mandates these actions. The act of sitting down during the national anthem is protected by the First Amendment of the U.S. Constitution, which guarantees freedom of speech and expression. However, certain states or organizations may have their own rules or policies regarding appropriate behavior during the national anthem, and failure to comply with these rules could potentially result in consequences such as being asked to leave an event or facing public criticism.