"Spring" was a piece of music, composed by Vivaldi, that was part of "The Four Seasons".
When the Sixth Doctor called Signpost to determine why it was interfering with his TARDIS, the "on-hold" music was "Spring". He listened to it twenty-one times and angrily demanded of Vishesh Abeyesekere that he play something else, even if it was only "Summer". (PROSE: Outsourcing)
During their "conference call" with Strax, River Song and Clara Oswald, Jenny and Madame Vastra played "Spring" from The Four Seasons in their home. (TV: The Name of the Doctor)
Behind the scenes[]
A public domain version of the piece
Although not named in The Name of the Doctor, enough of the famous piece is played for clear recognition.