Hobed o hilion / Bugail yr Hafod,
Manuscript scores of 'Hobed o hilion' ('Bugail yr Hafod'), an arrangement for solo violin, string orchestra and harp, with orchestral parts. 'Re-arranged Cardiff, Jan. 1947'. One score in the hand of a copyist differs considerably from the original composer's score.
Two manuscript orchestral scores of 'Hwb i'r galon' ('A song of good cheer'), dated Cardiff, January 1953. Also scores for the orchestral parts.
Manuscript full score of the composition 'Allegro for strings'.
Manuscript arrangements of 'Hen wlad fy nhadau' for piano, with parts for violin I & II, viola and cello.
Manuscript score of an arrangement for the signature tune 'Os gwelwch yn dda', with orchestral parts. An alternative title suggested 'Y ferch o blwy Penderyn'.
Mini-variations on a Welsh theme,
Manuscript piano sketches ('before brass scoring') of 'Mini-variations on a Welsh theme', along with a set of orchestral parts. Based on the Welsh folk tune 'Hob y deri dando': Deheubarth-South Wales Version.
Four miniatures for string quartet,
Manuscript score of 'Four miniatures for string quartet'. The titles are 'Grace's tune', 'Sian's tune', 'a tune for Dadcu', and 'Everybody's tune. Includes some parts. Published: Mansel Thomas Trust, Ref: MT270.
Two movements for string quartet,
Manuscript full score and string parts of 'Two movements for string quartet'. Published: Mansel Thomas Trust, Ref: MT269.
Manuscript full score of 'Variations on a nursery tune' (Sur le Pont d'Avignon), for string quartet with parts for strings. Also a sketch entitled 'Theme and variations', being a different title for the same work. Published: Mansel Thomas Trust, Ref: MT274.
Manuscript score of 'Hela'r sgyfarnog', an arrangement for a quintet, together with parts for cor anglais, violin, viola, cello and piano. Published: Mansel Thomas Trust, Ref: MT271, as 'Welsh Traditional Melody Arrangements', for Oboe, Violin, Viola, ‘Cello & Piano'.
Manuscript full score for each movement of 'Piano quintet' (also known as 'Quintet for piano and strings'), an arrangement of a quintet for piano and strings, together with parts for piano, violins, viola and cello. Published: by Mansel Thomas Trust, Ref: MT267.
Manuscript score of 'Y gôg lwydlas' a traditional Welsh melody arranged for a trio, together with parts for violin and cello. Published: Mansel Thomas Trust, Ref: MT276.
Manuscript scores of 'Y Gwydd', a traditional Welsh melody arrangement for trio and quintet. Full piano score for version 1 and 3 (quintet), together with scores for violin, oboe, viola and cello. Also, parts for oboe, viola and cello (Version 2, and a score for Cor anglais as an alternative to oboe). Violin part for version 3 (quintet). Published: Mansel Thomas Trust, Ref. MT266.
Manuscript score of the sacred song 'Mewn i Salem bur', by D. Christmas Williams, with orchestration by Mansel Thomas. Includes a full score and orchestral parts.
Manuscript score of 'Crossing the plain', by T. Maldwyn Price. Orchestration of the chorus for male choir by Mansel Thomas. Includes full score and orchestral parts.
Workbooks and manuscripts compiled during the period 1918-1930. The earliest workbook of music was compiled with the help of his father, Theophilus Thomas. The majority of this group date from the time he was at the Royal Academy of Music in London, and received his external B.Mus degree from Durham University.
Workbook containing a score to 'Eventide' for solo piano.
Workbooks containing music score and parts of trios for piano, violin and cello. Comprises 'A little prelude', 'A little scherzo', and 'A folk tune' composed by Megan Lloyd and arranged by Mansel Thomas.
Small group of miscellaneous sketches and fragments of his work. Many were composed after he had suffered a stroke in September 1979.
Group of sketches and drafts relating to his work 'Jubilate Deo' - Psalm 100.