Table:
text: Rockmelons
Discography
Singles
Year_ Title Lead_vocalist ARIA_chart_position Album_
1985 Time Out (For Serious Fun) Sandi Chick N/A -
1985 Sweat It Out Peter Blakeley N/A -
1987 Rhymes John Kenny N/A Tales of the City
1987 New Groove John Kenny N/A Tales of the City
1988 What`s It Gonna Be John Kenny N/A Tales of the City
1988 Jump Wendy Matthews N/A Tales of the City
1988 Dreams in the Empty City John Kenny N/A Tales of the City
1988 Boogietron Ensemble N/A Tales of the City
1991 Ain`t No Sunshine Deni Hines 5 Form 1 Planet
1992 That Word (L.O.V.E.) Deni Hines 4 Form 1 Planet

text: Rockmelons
Discography
Singles
Year_ Title Lead_vocalist ARIA_chart_position Album_
1992 It`s Not Over Deni Hines 15 Form 1 Planet
1992 Stronger Together Doug Williams - Form 1 Planet
1992 Love`s Gonna Bring You Home Doug Williams - Form 1 Planet
1993 Form One Planet Eric Sebastian - Form 1 Planet
2002 All I Want Is You Jeremy Gregory 41 Rockies 3
2002 I Ain`t Playin` Roxane LeBrasse 79 Rockies 3
2002 Police Woman 2002 (with Groove Quantize) N/A - -

Question: From the list of rockmelons, how long have they been producing singles?

Question: What is the total number of singles for Rockmelons?