Question: Who taught the oboe in the "small, rather stuffy music room" in the basement where Lennon and McCartney sat at the piano and composed 'I Want to Hold Your Hand'?
About the article "I Want to Hold Your Hand", section "Background and composition".

Candidate passages:
Although it is said that Brian Epstein had encouraged Lennon and McCartney to write a song to appeal to American listeners this has been denied by George Martin.
McCartney had recently moved into 57 Wimpole Street, London, where he was living as a guest of Dr Richard and Margaret Asher, whose daughter, actress Jane Asher, had become McCartney’s girlfriend after meeting him earlier in the year.
This location briefly became Lennon and McCartney's new writing base, taking over from McCartney’s Forthlin Road home in Liverpool.
Margaret Asher taught the oboe in the "small, rather stuffy music room" in the basement where Lennon and McCartney sat at the piano and composed 'I Want to Hold Your Hand'.
In September 1980, Lennon told "Playboy" magazine:In 1994, McCartney agreed with Lennon's description of the circumstances surrounding the composition of "I Want to Hold Your Hand", saying:
John Lennon played various guitars with the Beatles and during his solo career, including the Rickenbacker (four variants thereof), Epiphone Casino, and various models of Gibson and Fender guitars.
His other instrument of choice was the piano, on which he also composed many songs.
For instance, Lennon's jamming on a piano together with Paul McCartney led to creation of "I Want to Hold Your Hand" in 1963.
But Lennon's musicianship went far beyond guitar and piano.
Julia Lennon was John's estranged mother and her banjo was the first instrument that John Lennon learned to play before he switched to guitar:'sitting there with endless patience until I managed to work out all the chords'.
According to John, it was Julia who turned him onto rock ’n’ roll and actively encouraged him to pursue his musical ambitions.
After Julia's untimely death in 1958 the instrument was never seen again and its whereabouts remains a mystery.
Lennon also played keyboards besides piano (electric piano, Hammond organ, harmonium, Mellotron, harpsichord, clavioline), harmonica, six-string bass guitar (either he or George Harrison, when McCartney was playing piano or guitar), and some percussion (in the studio). 
The typical set list for the shows was as follows (with lead singers noted): "Twist and Shout" (John Lennon) "I Want To Hold Your Hand" (John Lennon and Paul McCartney) "I Saw Her Standing There" (Paul McCartney) "You Can't Do That" (John Lennon) "All My Loving" (Paul McCartney) "I Wanna Be Your Man" (Ringo Starr) "She Loves You" (John Lennon and Paul McCartney) "Till There Was You" (Paul McCartney) "Roll Over Beethoven" (George Harrison) "Can't Buy Me Love" (Paul McCartney) "This Boy" (John Lennon, Paul McCartney and George Harrison) "Long Tall Sally" (Paul McCartney)  
Wimpole Street is a street in central London.
Located in the City of Westminster, it is associated with private medical practice and medical associations.
No.
1 Wimpole Street is an example of Edwardian baroque architecture, completed in 1912 by architect John Belcher as the home of the Royal Society of Medicine.
64 Wimpole Street is the headquarters of the British Dental Association.
Wimpole Street was home to a few celebrities, such as Paul McCartney who lived at the home of the Asher family at 57 Wimpole Street in 1964–1966 during his relationship with Jane Asher.
At this address John Lennon and Paul McCartney wrote "I Want to Hold Your Hand" in the front basement room, while McCartney wrote the tune to "Yesterday" in a box room at the top of the house.
On the corner of Wimpole and Wigmore Street took place a legal case about causing a "nuisance" between neighbours, in "Sturges v Bridgman" (1879).
In 1932, Paul Abbatt and Marjorie Abbatt opened a toy shop, Paul & Marjorie Abbatt Ltd, designed by their friend, the architect Ernő Goldfinger, at 94 Wimpole Street.
The shop was unique in that children were allowed to touch and play with the displayed toys. 
A number of songs written primarily by the duo and recorded by the Beatles were credited as follows: "What Goes On" (1965) Lennon–McCartney–Starkey "Flying" (1967) Harrison–Lennon–McCartney–Starkey "Dig It" (1969) Lennon–McCartney–Starkey–Harrison "Maggie Mae" (1969) Arrangement by Lennon–McCartney–Harrison–Starkey "Free as a Bird" (1995) Original composition by John Lennon, Beatles version by John Lennon/Paul McCartney/George Harrison/Ringo Starr "Christmas Time (Is Here Again)" (1995 edit of 1967 fan club version) Lennon–McCartney–Harrison–Starr The German-language versions of "I Want to Hold Your Hand" and "She Loves You" were also credited to additional songwriters for assisting with the translation: "Komm, Gib Mir Deine Hand" was credited to Lennon–McCartney–Nicolas–Heller and "Sie Liebt Dich" was credited to Lennon–McCartney–Nicolas–Montague.