On his retirement from the horn section, the orchestra made Klaus Wallendorf its "one and only resident poet for life". The ceremonial presentation can be seen here, and at the end of that clip is one of his concoctions, a song that contains the names of 19 Tokyo subway stations, written after an evening of Japanese hospitality. (See the youtube version here.)
Was it Sarah Willis, then, who organised and encouraged the Gartenschlauchorchester that we saw at the Berlin Phil's open day in June 2015? By gum, it was - she's on the left -
The orchestra's website is worth a visit, eg for the (short) trailers of the movies, for the many (longer) interviews with musicians, and for the history of the concert hall.
And if horns are right up your street, the "Ho, Ho, Horn" Christmas concert can be seen online, free - https://www.digitalconcerthall.com/en/concert/23819
While at that open day in June 2015, we were lucky enough to hear the orchestra, for free - though getting a seat was a bit of a scrum, ganz unordentlich, rather un-German. We sat in the balcony on the right... happy memories ...