Manuscript score of 'Y Fwyalchen', with cello parts (one photocopy with Megan's pencilled markings for 1995 publication), of the traditional melody arranged for cello and piano. Published: Mansel Thomas Trust, under title 'Five Welsh Traditional Melody Arrangements for Cello (or Violin or Viola)', Ref: MT114.
Manuscript piano score arrangement of the traditional tune 'Hun Gwenllian' (Gwenllian’s repose) for piano and cello, with a viola part separate. Published: Mansel Thomas Trust, under title 'Five Welsh Traditional Melody Arrangements for ‘Cello (or violin or viola)', Ref: MT114.
Variants II for unaccompanied cello,
Manuscript scores of 'Variants II for unaccompanied cello'. No.1 is the composers manuscript, No.2 is a photocopy of the manuscript with some additional markings, No.3 is a photocopy of first page only, with markings, No.4 is a photocopy of No.1. Published: Mansel Thomas Trust, Ref: MT120.
Manuscript scores of arrangements by Mansel Thomas for instrumental duo and duets.
Manuscript score of 'Six Basingstoke walks' a piano duet. Comprises two sets of three 'walks' in one copy. Three little walks being 'Coniston Road', 'Windermere Avenue' and 'Derwent'; Three more walks 'Emmerdale Close', 'Pack Lane' and 'Kempshott Lane'. Published: Mansel Thomas Trust, Ref: MT115.
Manuscript score of 'Nos Calan', an arrangement for two pianos of a traditional Welsh melody (two copies). Published: Mansel Thomas Trust, Ref: MT107.
Manuscript scores of 'Dance of the four clogs' (Dawns y pedair clocsen), an arrangement for two pianos of a traditional Welsh melody. Comprises 2 copies in the hand of the copyist, with additions (one being a photocopy), a loose sheet of the last page, a single copy used for television (1962) and copies I and II of the the arrangement. Published: Mansel Thomas Trust, Ref: MT109.
Welsh traditional melody arrangements,
Manuscript scores of arrangements by Mansel Thomas of traditional Welsh folk songs for mixed voices.
Where are you going? = Ble'r wyt ti'n myned?,
Manuscript score of arrangement of 'Ble'r wyt ti'n myned?' (English words, Mary Ll. Davies), for unaccompanied mixed voices. Published Magor: Mansel Thomas Trust, Ref: MT058 [1998?].
Can you see my mother? = Dacw Mam yn dwad,
Manuscript score of an arrangement of 'Dacw Mam yn dwad' for mixed voices and piano. Published Magor: Mansel Thomas Trust, Ref: MT062 [1998?].
Incomplete photocopy of a manuscript score of 'Bugail yr hafod' (pp. 11-16 only), arranged for unaccompanied mixed voices and soloist.
Manuscript scores of sacred or liturgical works, consisting mainly of hymns and anthems, composed or arranged by Mansel Thomas for mixed voices.
Manuscript orchestral score (in nine sections, numbered 1, 2, 3/3a, 4/4a, 5, 6, 7, 8, 9) and orchestral parts score.
4 Hymns for evensong (7th June 1959),
Manuscript part scores of 'Hymns for evensong', arranged for a string quartet.
Manuscript part scores of 'St Peter', arranged for string quintet.
Manuscript full scores and string parts of 'Music for a family', for string quartet'. Published: Mansel Thomas Trust, Ref: MT272.
Manuscript full score of 'Yr hen erddygan', an arrangement for a quintet, together with parts for oboe, violin and viola (part for solo cello is wanting). Published: by Mansel Thomas Trust, Ref: MT121, under title of 'Welsh Traditional Melody Arrangements', five arrangements for Oboe, Violin, Viola, ‘Cello & Piano. (Oboe part transferable to Flute or Clarinet or Violin).
Going with Deio to Towyn (Wrth fynd efo Deio i Dowyn),
Manuscript full score of 'Going with Deio to Towyn' (also known as 'Wrth fynd efo Deio i Dowyn), an arrangement for a quintet, together with parts for oboe, violin, viola and cello. Published: by Mansel Thomas Trust, Ref: MT121, under title of 'Welsh Traditional Melody Arrangements', five arrangements for Oboe, Violin, Viola, ‘Cello & Piano.
Manuscript full score of 'Dance of the four clogs', an arrangement for a quintet, together with parts for piano, violins, viola and cello. This arrangement was compiled between 1939-1940. Published: by Mansel Thomas Trust, Ref: MT122, under title of 'Welsh Traditional Melody Arrangements', arranged for piano quintet – 2 Violins, Viola, ‘Cello & Piano.
Manuscript full score for 'Hela'r 'sgyfarnog', a traditional Welsh melody arrangement for trio. Full score and parts for cor anglais (2), viola and cello. Published: Mansel Thomas Trust, Ref: MT278.