Not that I know of any sch that admit a student under music alone as DSA.
Rather MEP is a subject that is offered in those schools that have this and to take it up, one must have at least Grade 3.
There are schools who look at DSA applications under the domain of "Music".
RI/RGS Music Domain
"The minimum qualifications for Music Domain applicants are Practical Grade 7 Distinction and Theory Grade 5, or equivalent qualifications. Successful applicants for Music Domain are required to join the Music Elective Programme (MEP) and a musical CCA group offered to them according to their talents."
DSA (MEP):Musically talented pupils to join Music Elective Programme (MEP)
Er...the rest....you go and look at the individual schools yourself, if interested, lah. Only have 7 schools that officially have MEP.
http://www.moe.gov.sg/education/admissi ... programme/
Anglo-Chinese (Independent) Independent
CHIJ St. Nicholas Girls’ SAP, Autonomous
Dunman High SAP, Autonomous
Methodist Girls’ Independent
Raffles Girls’ School Independent
Raffles Institution Independent
Tanjong Katong Girls’ Autonomous