The curriculum of the school was wide and in addition to Biblical Hebrew, included English, French, German, as well as Mathematics and Science.

Singer thus spoke German and French fluently, and some Italian, acquired a working knowledge of Latin and Greek, and was generally well-educated in the arts and sciences.

He had no love for the minute critical analysis of the Bible, but he was attracted to the theory of progressive revelation, and thus was favourably disposed to the modern treatment of the Old Testament.

He "held aloof... from all Zionist schemes", believing in the restoration of Israel to the Promised Land but nonetheless having doubts about political Zionism.

His interest in the fortunes of foreign Jews led him to make several continental journeys on their behalf; he was one of the leading spirits of the Russo-Jewish Committee, of the Jewish Association for the Protection of Girls and Women and of other philanthropic organisations.

The Hebrew text was that of Seligman Baer's classic Avodat Yisrael, to which Singer provided an "authorised" version of the liturgy capable of standardising and stabilising the synagogue service and helping to create an "established" Judaism in Britain and the Commonwealth (the so-called "Minhag Anglia".)

The Siddur was expanded in 1917 under Chief Rabbi Joseph Hertz; 1934 saw a "continuous" version, minimising the need for cross-reference, and which also incorporated additional material.

The 1962 Second Edition, under Chief Rabbi Israel Brodie, was completely re-typeset; also the translation was amended where it had become unclear or archaic, and further additional material had been introduced.

In 1896 the Cambridge University Press published Talmudical Fragments in the Bodleian Library of which Singer was joint author with Solomon Schechter.