When Hardebeck died in 1945, a Radio Éireann-sponsored symphony concert, held in the Capitol Theatre in Dublin, began with a sympathetic performance of his orchestral variations upon "Seoithín Seó". A state funeral was held in Saint Joseph's Church, Berkeley Road, Dublin. The church was packed; various government ministers, the Lord Mayor and representatives of the President and of Éamon de Valera were there. Hardebeck's own "Kyrie" and "Agnus Dei" were performed at the requiem mass. He was interred in Glasnevin Cemetery, where a "Benedictus" was chanted by the clergy present. A vote of sympathy was issued by the Irish National League of the Blind to Hardebeck's widow and relatives, in which the hope was expressed "that the nation as a whole would not be unmindful of the important contribution which the late Dr Hardebeck had made to Irish culture, music and art".